MX-5050mkIV-2/BIII manual, edition 4

Transcription

Part No. OS3-298
Lot: E
MX-5050 MKIV-2, BIII-2
MASTER TAPE RECORDER
OPERATION AND MAINTENANCE MANUAL
FOURTH EDITION
Printed: Dec 1997
Ed 4 (MA)
Copyright © 1992, 1997 Otari, Inc. and Otari Corporation
Printed in Japan
This manual may not be reproduced by any means without written permission.
CAUTION
To prevent fire or shock hazard:
Do not expose this unit to rain or moisture.
Do not remove panels (unless instructed to do so).
There are no user-serviceable parts inside.
Refer servicing to qualified service personnel.
PLEASE READ THROUGH THE SAFETY INSTRUCTIONS ON THE NEXT PAGE.
SAFETY INSTRUCTIONS
1.
Read Instructions
All the safety and operating instructions should be read before the device is
operated.
2.
Retain Instructions
The safety and operating instructions should be retained for future.
3.
Heed Warnings
All warnings on the device and in the operating instructions should be
adhered to.
4.
Follow Instructions
All operating and use instructions should be followed.
5.
Water and Moisture
The device should not be used near water — for example, near bathtub, wash
bowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool,
etc.
6.
Carts and Stands
The device should be used only with a cart or stand that is recommended by
the manufacturer.
7.
Ventilation
The device should be situated so that its location or position does not interfere
with its proper ventilation. For example, the device should not be situated on a
bed, sofa, rug, or similar surface that may block the ventilation openings; or,
placed in a built-in installa-tion, such as a bookcase or cabinet that may impede
the flow of air through the ventilation openings.
8.
Heat
The device should be situated away from heat sources such as radiator, heat
registers, stoves or other appliances (including amplifiers) that produce heat.
9.
Power Sources
The device should be connected to a power supply only of the type described
in the operating instructions or as marked on the device.
10.
Grounding or Polarization
Precautions should be taken so that the grounding or polariza-tion means of
the device is not defeated.
11.
Power Cord Protection
Power supply cords should be routed as they are not likely to be walked on
or pinched by items placed upon or against them, paying particular attention
to cords at plugs, convenience recep-tacles, and the point where they exit
from the device.
12.
Cleaning
The device should be cleaned only as recommended by the manufacturer.
13.
Non-Use Periods
The power cord of the device should be unplugged from the out-let when left
unused for a long period of time.
14
Object and Liquid Entry
Care should be taken so that objects do not fall and that liquids are not
spilled into the enclosure through openings.
15.
Damage Requiring Service
The device should be serviced by qualified service personnel when:
A.
B.
C.
D.
The power-supply cord or the plug has been damaged; or
Objects have fallen, or liquid has been spilled into the appliance; or
The appliance has been exposed to rain; or
The appliance does not appear to operate normally or exhibits marked
change in performance; or
E. The appliance has been dropped, or the enclosure damaged.
16.
iv
Servicing
The user should not attempt to service the device beyond that described in
the operating instructions. All other service should be referred to qualified
personnel.
COMMUNICATION WITH OTARI
FOR SERVICE INFORMATION AND PARTS
All Otari products are manufactured under strict quality control. Each unit is carefully inspected and tested prior to
shipment.
If, however, some adjustment or technical support becomes necessary, replacement parts are required, or technical
questions arise, please contact your Otari dealer or contact Otari at:
Otari, Inc.
4-33-3 Kokuryocho, Chofu-shi,
182-0022, Tokyo, Japan
Phone
: (81) 42481-8626
Fax
: (81) 42481-8633
Otari Corporation
8236 Remmet Ave.
Canoga Park, CA 91304
U.S.A.
Phone
: (818) 594-5908
Fax
: (818) 594-7208
Otari Europe GmbH.
Rudolf-Diesel-Straße 12
D-40670 Meerbusch 2 (Osterath)
Germany
Phone
: (49) 2159-50861
Fax
: (49) 2159-1778
Otari Singapore Pte., Ltd
40 MacTaggart Road
Singapore 368085
Phone
: (65) 284-7211
Fax
: (65) 284-4727
Another part of Otari’s continuing technical support program for our products is the continuous revision of manuals as the
equipment is improved or modified. In order for you to receive the information and support which is applicable to your
equipment, and for the technical support program to function properly, please include the following information, most of
which can be obtained from the Serial number label on the machine, in all correspondence with Otari:
•
•
•
•
Model Number:
Serial Number:
Date of Purchase:
Name and address of the dealer where the machine was purchased and the power requirements (voltage and
frequency) of the machine.
v
Table of Contents
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Communication with Otari . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Section 1 Introduction
1.1 MX-5050 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2 Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.1 Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.2 Conventions within this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Section 2 Installaion
2.1 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Audio Signal Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1 Audio Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2 Balance/Unbalance Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.3 Switch Position Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.4 PCB Assembly Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.4.1 MX-5050 BIII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.4.2 MX-5050 MKIV2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.5 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.6 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.7 Speed Conversion (BIII-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.8 Equalizer Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Section 3 Controls and Indicators
3.1 Tape Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2 Transport Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.3 Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.4 Amplifier Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.5 Audio Connector Panel
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.6 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Section 4 Operation
4.1 Operation Mode Reference Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.1 Transport Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.2 Audio Channel Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
May 1992
vii
Table of Contents
MX-5050 Operation and Maintenance Manual
4.3 Operating the MX-5050 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.3.1 Placing Reels on the Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.3.2 Threading the Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.4 Operation of the Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.4.1 Playing Back the Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.4.2 Recording the Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.4.3 SEL-REP Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
4.4.4 Fast Wind and CUE Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
4.4.5 Tape Editing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
4.4.6 Using the Pitch Control Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
4.5 Locator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
4.5.1 Storing Tape Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.2 Search Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.3 Search Play Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.4 Search Zero Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.5 Search Start Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.6 Repeat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-11
4-11
4-12
4-12
4-12
4-13
4.6 Test Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Section 5 Maintenance
5.1 Maintenance Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.2 Demagnetizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.3 Cleaning the Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.4 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Section 6 Transport Adjustment and Parts Replacement
6.1 Transport Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.2 Brake Torque Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.3 Tape Lifter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.4 Capstan Motor Adjustment and Pitch Control Adjustment . . . 6-5
6.5 Pinch Roller Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6.6 Tape Speed Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6.7 Reel Table Height Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
6.8 Head Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6.9 Head Position Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
viii
May 1992
Table of Contents
Section 7 Audio Alignment
7.1 Tools and Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.2 Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.2.1 Peak Indicator Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.2.2 Test Oscillator Waveform and Level Adjustment . . . . . . . . . . . . . . . . . . . . . 7-4
7.3 Reproduce Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.3.1 Reproduce Head Azimuth Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.3.2 Reproduce Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
7.3.3 Reproduce Equalization Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
7.4 Record Electronics Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7.4.1 Record Bias Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7.4.2 Record Head Azimuth Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
7.4.3 Record Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
7.4.4 Record Equalization Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
7.4.5 Low Frequency Reproduce Equalization Adjustment . . . . . . . . . . . . . . . . 7-11
7.4.6 SEL-REP Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Section 8 Specifications
8.1 Tape Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2 Electoronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Section 9 Exploded Views and
BIII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2 ~ 9-19
MKIV-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-20 ~ 9-39
Appendix
Block Diagram
Troubleshooting Hints (Electronics)
Troubleshooting Hints (Transport)
Index
Schematic Diagrams
May 1992
ix
List of Figures
Figure 1-1 Exterior Appearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Figure 2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
Audio Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Balanced/Unbalanced Connectors . . . . . . . . . . . . . . . . . . . . . 2-4
Switch Setting on Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Controls on the CONTROL PCB Assembly . . . . . . . . . . . . . 2-6
PCB Assembly Location (BIII) . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
AMP Section Rotation (BIII) . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
CONTROL PCB Assembly Rotation (BIII) . . . . . . . . . . . . . 2-10
PCB Assembly Location (MKIV-2) . . . . . . . . . . . . . . . . . . . . 2-11
CONTROL PCB Assembly Rotation (MKIV-2) . . . . . . . . . 2-12
Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
AC Line Voltage Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Fuse Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Figure 3-1
3-2
3-3
3-4
3-5
3-6
Tape Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Transport Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Amplifier Panel (MKIV-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Audio Connector Panel (BIII) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Audio Connector Panel (MKIV-2) . . . . . . . . . . . . . . . . . . . . 3-10
Figure 4-1 Tape Threading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4-2 Editing a Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Figure 5-1 Demagnetizing the Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5-2 Cleaning the Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5-3 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
May 1992
Figure 6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
Brake Torque Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Brake Torque Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Tape Lifter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Waveform on Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Pinch Roller Pressure Measurement . . . . . . . . . . . . . . . . . . 6-6
Pinch Roller Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Pinch Roller Pressure Measurement . . . . . . . . . . . . . . . . . . 6-7
Reel Table Height Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Head Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Height/Zenith Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Wrap Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Figure 7-1
7-2
7-3
7-4
7-5
REC/REP AMP PCB Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Head Adjustment Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Wave Shape on the Oscilloscope . . . . . . . . . . . . . . . . . . . . . . 7-6
Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Waveshape on the Oscilloscope. . . . . . . . . . . . . . . . . . . . . . . . . 7-9
xi
List of Tables
May 1992
Table
2-1
2-2
2-3
2-4
2-5
2-6
2-7
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Settings on Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
DIP SW Setting on the Control PCB . . . . . . . . . . . . . . . . . . . . . . 2-6
Capstan PLL Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
SEARCH 3 Key Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Machine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Fuse Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Table
3-1 Parallel I/O Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3-2 Connector Pin 21, 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3-3 Remote Control Connector (MKIV-8 Option) . . . . . . . . . . 3-13
Table
4-1
4-2
4-3
4-4
4-5
Table
5-1 Maintenance Time Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5-2 Tools Required for Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Table
6-1 Necessary Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6-2 Brake Tension Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6-3 Tape Speed Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Table
7-1 Reference Tapes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7-2 Trigger Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7-3 Overbias Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Transport Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Audio Channel Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Auto Locator Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Vari Pitch Preset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Cue Point Set Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
xiii
This Section includes a general description of the features of the MX-5050
series tape recorders and information on the structure of this manual.
1.1 MX-5050 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2 Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.1 Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.2 Conventions within this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
May 1992
1-1
1.1 The New MX-5050 Series
The features of the MX-5050 Series tape recorders are described below.
The new MX-5050 Series is divided into the following models:
MX-5050 BIII-F
MX-5050 BIII-2
MX-5050 BIII-2E
MX-5050 BQIII
MX-5050 MKIV2
MX-5050 MKIV2E
MX-5050 MKIV4
MX-5050 MKIV8
Full Track, 1/4" Track Width
2 Channel, NAB 1/4" Track Width
2 Channel, DIN 1/4" Track Width
4 Channel, 1/4" Track Width
2 Channel, NAB 1/4" Track Width
2 Channel, DIN 1/4" Track Width
This manual describes the MX-5050 MKIV-2, 2E, BIII-F, BIII-2 and BIII-2E
models.
BIII
MKIV-2
Figure 1-1
Exterior Appearance
1-2
May 1992
Features of the MX-5050 Series
In addition to the usual tape recorder functions, the MX-5050 series has
various additional features. All MX-5050 series tape recorders have the
OTARI Standard Parallel I/O connector which allows for post production
editing work with a synchronizer using time code. The tape timers include a
Mini Locator for more advanced locator functions.
In addition to these functions, these machines also have the following
features: Sel-Rep (Selective Reproduce), Edit mode function which permits
tape spilling, CUE monitoring which enables monitoring the tape in F.FWD or
RWD mode, Standby function for easy multi-channel recording, and Variable
Pitch Control function (±20%).
1.2 Using This Manual
1.2.1 Organization
This manual is divided into ten sections as follows.
This section describes the features of the MX-5050 series tape recorders and
the structure of this manual.
Section 2 Installation
This section describes the procedures for unpacking and hooking up the
machine. This section also includes the DIP switch presettings.
This section describes the name and function of each control. The connector
pin assignments are also included.
Section 4 Operation
This section explains each mode of the machine and the basic procedures for
reproducing and recording a tape.
This section describes procedures for daily maintenance.
This section describes the adjustment procedures for transport mechanisms
and replacement procedures.
This section describes the electrical adjustment of the Reproduce and Record
circuits.
This section of the manual contains the operating specifications for MX-5050
series tape recorders.
Section 9 Exploded Views and Parts Lists
This section of the manual contains assembly drawings of the machine
"exploded" to show internal parts and hardware, and the order of assembly.
Each exploded view is keyed to an accompanying parts list showing Otari
part numbers and descriptions for all mechanical components.
May 1992
1-3
Appendix A Block Diagrams
This appendix includes block diagrams of the MX-5050 and level diagrams of
the circuitry.
Appendix B Troubleshooting
This section describes some typical problems which may occur during
operations, their possible causes and how to handle them.
1.2.2 Conventions within this manual
PCB Assemblies: The term PCB Assembly is used in this manual to refer to a
printed circuit board which has components (resistors, connectors, etc.)
mounted on it. The term PCB or Printed Circuit Board, when used alone
refers to the "bare" printed circuit board without components. The term PCB
is rarely used outside of the electrical and mechanical parts lists. When a
PCB Assembly is referred to in the text, the name or function of that PCB
Assembly will usually be given in ALL CAPITAL letters.
Type conventions
ALL UPPER CASE - Generally, this manual uses all upper case type to
describe a switch or control when that item is similarly labeled on the
machine (e.g., the PLAY button).
First Letter - Where a switch or button is not Upper Case labeled, or the
reference is less clear, only the first letter of the item is capitalized (e.g., the
Cue Wheel near the CUE button). Machine status or operating modes are
described with an upper case first letter (e.g., you press the PLAY button to
place the machine in Play mode).
( ), [ ] - Normal parentheses ( ) are used for examples and parenthetic
comments. Square brackets [ ] are used to refer to certain illustrations. When
used in text, the square brackets are either references to the same figure as
noted in that sub-section (e.g., [3], meaning the part labeled "3" in the figure
noted) or are preceded by the figure number (e.g., Fig. 2-1, [3], meaning "3"
in Figure 2-1).
1-4
May 1992
This section of the manual provides information on unpacking and inspecting
the tape recorder, and on power and signal connections. Refer to this section
when first setting up the machine.
This section includes the following sub sections.
2.1 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Audio Signal Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1 Audio Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2 Balance/Unbalance Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.3 Switch Position Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.4 PCB Assembly Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.4.1 MX-5050 BIII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.4.2 MX-5050 MKIV2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.5 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.6 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
2.7 Speed Conversion (BIII-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.8 Equalizer Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
May 1992
2-1
2.1 Unpacking and Inspection
After receiving the MX-5050, examine the case for any signs of damage.
Then unpack and inspect the equipment. Take care when unpacking the
equipment and removing packing materials to prevent damaging the critical
components such as the capstan, head assembly, and tension arms. If there
is any evidence of damage due to rough handling during transportation, a
claim should be filed with the transportation company. We recommend
retaining the packing material at least until proper operation of the machine
has been established.
Verify that all items, as listed in Table 2-1, have been received. Do not
connect or operate the MX-5050 until this inspection has been completed.
When sending the machine back to the local OTARI dealer or to OTARI, follow
the packing directions printed on the carton.
Table 2-1
Standard Accessories
MX-5050 BIII, MKIV-2
2-2
Parts Name
Part No.
Quantity
Reel Clamp
Power Cable
Manual
Lubrication Oil
Fuse 1A
(Fuse 1A 200-240V only
Fuse 2A
Fuse 2A
Fuse 3A
Fuse 4A
Fuse 5A
KW0HV
PZ9D003
OS3-298
PZ9E003
FH7F010
FH9-032
FH9-030
FH7F020
FH7F030
FH7F040
FH7F050
2
1
1
1
1
1)
1
1
1
1
1
May 1992
2.2 Audio Signal Connection
2.2.1 Audio Connectors
The input to the machine is transformerless and balanced with an input
impedance of 10 kΩ. The input level is fixed to +4dBu.
The output from the machine is transformerless and balanced. The nominal
output level is selected from +4 dBu or -16 dBu with the switch on the rear
panel. The output level is set to +4 dBu at the factory.
The microphone input is balanced with an input impedance of 10 kΩ. Input
level can be attenuated by 20 dB with the attenuation switch on the rear
panel.
The connections to the Input/Output connectors are as shown in Figure 2-1.
BIII
PARALLEL
I/O
CH 1
CH 2
LINE OUTPUT
GROUND
CH 2
CH 1
LINE INPUT
CH 1
CH 2
MIC INPUT
POWER
OUTPUT
INPUT
MKIV-2
INPUT
LINE OUTPUT
CH 1
CH 2
OUTPUT LEVEL
LOW HIGH
EQUALIZATION
IEC NAB
REF FLUX
LOW MID HIGH
LINE INPUT
CH 2
CH 1
MIC INPUT
CH 2
CH 1
MIC ATTENUATOR
OdB-2OdB OFF
OUTPUT
Figure 2-1
Input/Output Connectors
May 1992
2-3
2.2.2 Balanced/Unbalanced Connection
The Input/Output connectors are balanced as shown in Figure 2-2. The pin
assignment of the connectors is as follows:
Pin 1:
Pin 2:
Pin 3:
Shield (GND)
Cold
Hot.
When connecting an unbalanced machine to the MX-5050, change the pin
assignment as shown in Figure 2-2.
2
1
1 GND
2
COLD
1
GND
(SHIELD)
1
2
COLD
2
3
HOT
3
3
HOT
Balanced Input
3
Balanced Output
2
1
GND
1
1 GND
2
2
1
3
3
HOT
3
HOT
Unbalanced Input
Figure 2-2
Balanced/Unbalanced Connectors
2-4
2
3
Unbalanced Output
Optional Input (ZA-53T)/Output (ZA-53S) Transformers are available from
OTARI. For details contact OTARI or your nearest OTARI dealer.
May 1992
2.3 Switch Position Adjustment
If necessary, change the following switch settings on the rear panel before
operating the machine.
Table 2-2
Settings on Rear Panel
Function
Switch
Setting
MIC. Attenuator
REF FLUX
EQ Setting
Output Level Setting
SW501
SW502
SW503
SW504
0dB/-20dB/OFF
H/M/L (320/250/185nWb/m)
NAB/IEC
H: +4dBu, L: -16dBu
BIII
PARALLEL
I/O
CH 2
LINE
GROUND
OUTPUT LEVEL
LOW
CH 1
OUTPUT
CH 2
LINE
CH 1
INPUT
CH 2
MIC
CH 1
INPUT
POWER
HIGH
EQUALIZATION
IEC
NAB
REF FLUX
LOW
MID
MIC ATTENUATOR
HIGH
OdB -2OdB OFF
MKIV-2
LINE OUTPUT
CH 1
CH 2
OUTPUT LEVEL
LOW HIGH
EQUALIZATION
IEC NAB
REF FLUX
LOW MID HIGH
LINE INPUT
CH 2
CH 1
MIC INPUT
CH 2
CH 1
MIC ATTENUATOR
OdB-2OdB OFF
Figure 2-3
Switch Settings on Rear Panel
May 1992
2-5
❏
Table 2-3
DIP SW Settings on the Control PCB
DIP SW settings on the CONTROL PCB
Note: When any of the following DIP SW settings are changed, the machine
must be turned off and on for the settings to take effect.
SW1
SW2
SW1-1 Speed Version
SW1-2 Punch-In
SW1-3 Punch-Out
SW1-4 Capstan PLL Reference
SW1-5 Capstan PLL Reference
SW1-6 Punch-In Type Select
SW1-7 REC LED Flashing Select
SW1-8 External Control Select
SW2-1 SEARCH 3 key Selection
SW2-2 SEARCH 3 key Selection
SW2-3 Stop Mute Selection
SW2-4 Fast Wind Mute Selection
SW2-5 Play Start Mute
SW2-6 Machine Type
SW2-7 Machine Type
SW2-8 Not used
C21
C18
C19
CN 27
C10
C9
CN3
CN26
VR6 VR5 VR4
D46
CN25
D45
VR3 VR2 VR1
D44
D43
CN24
CN23
SW2
CN7
SW1
SW3
Figure 2-4
Controls on the CONTROL PCB Assembly
Refer to Fig 2-4 for the location of these DIP switches on the CONTROL PCB
Assembly.
SW1-1 Speed Version Selection (BIII-2)
ON 3.75/7.5 ips: Low Speed Version (Option)
OFF 15/7.5 ips: High Speed Version
The BIII-2 is set to High Speed at the factory. After receiving the BIII-2, it can
be changed to Low Speed with this switch. Refer to §2.8 for details. The
MKIV-2 cannot be changed to Low Speed.
SW1-2 Punch-In (Refer to § 3.2, [18] REC button)
ON Press REC and PLAY buttons in PLAY mode to begin Punch-In
OFF Press REC button in PLAY mode to begin Punch-In
SW1-3 Punch-Out (Refer to § 3.2, [19] PLAY button)
ON Press PLAY button to end the Punch-In Record
OFF Press STOP and REC button to end the Punch-In Record
2-6
May 1992
SW1-4, 1-5 Capstan PLL Reference Setting
When the machine is in FIX mode, the capstan speed is adjusted with these
switches (refer to § 6.7).
Table 2-4
Capstan PLL Reference Setting
SW1-4
SW1-5
OFF SET (%)
ON
OFF
ON
OFF
ON
ON
OFF
OFF
+ 0.2%
– 0.2%
– 0.4%
Not used
SW 1-6 Adding Punch In Type Selection
ON
Edge Type
With this setting, the Punch In command signal is as shown above.
Additional Punch-Ins are made by pressing the PLAY and REC buttons (or
just the REC button) while in Ready mode.
OFF Level Type
With this setting, the Punch In command signal is as shown above.
Additional Punch-Ins are made by changing READY/SAFE switches from the
SAFE position to the READY position.
SW1-7 Flashing REC button selection
This switch selects whether the lamp on the REC button flashes when the
READY/SAFE switch is set to READY.
ON Illuminates (does not flash)
OFF Flashes
SW1-8 \
SW2-1, 2-2
These switches select the function of the SEARCH 3 key.
Table 2-5
SEARCH 3 Key Function
SW2-1
2-2
Function
ON
OFF
ON
OFF
ON
ON
OFF
OFF
Proximity Sensor ON/OFF key *
Not used
Search Start (§ 4.5.6)
Search Cue (§ 4.5.3) Default Setting
* When using the optional proximity sensor, pressing the SEARCH 3 key
enables/disables the Proximity Sensor Function.
May 1992
2-7
SW2-3
This switch selects whether the audio signal is muted during the time from
when the STOP button is pressed until the machine actually stops.
ON: Not Mute
OFF: Mute
SW2-4
This switch selects whether the audio signal is muted during Fast Wind
modes other than Fast Wind Cue mode.
ON: Not Mute
OFF: Mute
SW2-5
This switch selects whether the audio is muted during the time from when
the PLAY button is pressed until the tape enters Play mode.
ON: Not Mute
OFF: Mute
SW2-6, 2-7
These switch settings determine the machine type. These switches are set at
the factory and should not be changed.
Table 2-6
Machine Type
SW2-6
SW2-7
Type
Tape
Rehearsal
ON
OFF
ON
ON
ON
OFF
8CH
4CH
4CH
1/2"
1/2"
1/4"
O
O
O
Size
O
O
O
SW2-8
Not Used
2-8
May 1992
2.4 PCB Assembly Location
2.4.1 MX-5050 BIII
The PCB Assemblies are located as shown in Figure 2-5. The CONTROL PCB
Assembly is accessed by removing the rear panel. (Refer to Figure 2-9). The
CONTROL PCB can be rotated to adjust parts on the COMP side. To access
the REC/ REP AMP PCB Assembly, the AMP section of the MX-5050BIII must
be turned face up. The rotation of the AMP section is performed as follows.
BIII
SCREW
CONTROL PCB
CONTROL PCB
REC/REP PCB
REC/REP PCB
Figure 2-5
PCB Assembly Location (BIII)
❏
AMP Section Rotation
1. Turn off the machine. Place the machine so that the transport faces upward.
Refer to Figure 2-6.
2. Remove the four screws holding the Bottom Cover. Remove the Bottom
Cover from the machine.
3. Remove the four screws holding the AMP section. While lifting the AMP
section slightly, rotate it to a horizontal position.
Bottom Cover
AMP Section
Figure 2-6
AMP Section Rotation
May 1992
2-9
❏
CONTROL PCB Assembly Rotation
1. Turn off the machine. Place the machine in the upright position. See Figure
2-7.
2. Remove the Foot and Deck Stand from the Rear Cover.
3. Remove the Rear Cover by removing the screws holding it in place.
4. Loosen the two screws holding the Heat sink. Rotate the CONTROL PCB
Assembly on its side.
5. The Side Boards may need to be removed to access some controls on the
CONTROL PCB Assembly.
Figure 2- 7
2 - 10
May 1992
2.4.2 MX-5050 MKIV2
The AMP section of the MKIV-2 is adjusted after removing the Top Panel.
❏
Accessing the AMP Section
1. Turn off the machine. Remove the Top Panel (for MKIV-2).
2. Adjust the PCB Assemblies (REC/REP AMP PCB Assembly) located inside the
AMP section.
REC/REP PCB
REC/REP PCB
CONTROL PCB
SCREW
CONTROL PCB
Figure 2-8
PCB Assembly Location
May 1992
2 - 11
❏
Follow the steps below when adjusting the CONTROL PCB Assembly and
internal parts of the MKIV-2.
1. Turn off the machine. Lay the machine on its side.
2. Remove the Bottom Panel by removing the screws holding it.
3. Loosen the two screws holding the Heat Sink on the Control PCB Assembly.
Rotate the CONTROL PCB Assembly.
4. Depending on the parts to be adjusted, the side panel may also need to be
removed.
CONTROL PCB
REAR PANEL
Figure 2-9
CONTROL PCB Assembly Rotation (MKIV-2)
2 - 12
May 1992
2.5 Power Connection
Confirm that the power voltage marked on the rear panel corresponds with
the line voltage being used.
❏
Turning on the machine
For power connection, use the included Power Cable. Connect the Power
Cable plug to the power connector located at the rear of the machine. Make
sure that the machine is turned off before connecting the other end of the
power cable to the AC line outlet. The machine is now ready to be turned on.
Pressing the upper portion of the POWER Switch applies power to the
machine. After power is applied to the machine, the VU meters, tape timer
digits, and the indicator above the STOP button will illuminate. The Tape
Timer will show the selected tape speed for several seconds after the
machine is turned on, and then will change to tape time indication.
Turning on the machine while pressing the STOP button will cause the ROM
version of the Control PCB Assembly to be displayed.
PA
RA
LL
EL
I/O
PO
WE
R
GR
OU
ND
AC
Hot
GND
AC
Neutral
Figure 2-10
Power Connection
❏
AC Voltage Connector Replacement
When the AC Line Voltage is different from the factory setting, the Line
Voltage connector should be changed to the proper one. In this case, contact
OTARI or nearest OTARI dealer and order the proper Line Voltage connector.
The Line Voltage connector (white) is located beside the Supply Reel Motor.
First remove the rear panel and replace it. The following figure describes the
wiring of the connectors.
AC 100V
2
1
6
5
4
9
8
7
12
11
10
1-9 Brown
4-12 Brown
7-8 Brown
10-11 Brown
3
2
1
6
5
4
9
8
7
12
11
10
AC 200V
Figure 2-11
AC Line Voltage Connector
May 1992
AC 117V
AC 110V
3
1-3 Red
4-6 Red
7-8 Red
10 - 11 Red
3
2
1
6
5
4
9
8
7
12
11
10
AC 220V
3
2
1
6
5
4
8-12 Yellow
10 -11 Yellow
9
8
7
12
11
10
1-9 Yellow
1-2 Orange
4-5 Orange
7-8 Orange
10-11 Orange
AC 240V
3
2
1
6
5
4
6-8 Green
10 -11 Green
9
8
7
12
11
10
1-3 Green
3
2
1
1-2 Blue
6
5
4
5-8 Blue
10-11 Blue
9
8
7
12
11
10
2 - 13
2.6 Fuse Replacement
If a fuse is blown, first check the cause of the blown fuse, then replace the
fuse with a new one as follows.
CAUTION: For continued protection against fire hazard, replace only with the
same type of fuse. Before replacing a fuse, disconnect the power cable from
the AC line.
First refer the Table 2-1 for information on the eight fuses.
Replacement of the Main Fuses
1. Remove the left side panel by removing the screws holding it.
2. Referring to the Figure 2-11, find the fuse location.
3. Locate the blown out fuse(s).
4. Replace the blown out fuse(s) with a new one(s).
MKIV-2
BIII
R
F6
F7
F8
5A
1A
4A
+24V
CAP. MOT
VU LAMP
2A
F4
2A
3A
F3
F5
-18V
+18V
+5V
COMP SIDE
-18V
!
AC LIVE
F1
100 - 120 V 2A
200 - 240 V 1A
2A
F2
REEL MOTOR
-18V
+24V
2A
4A
+18V
F1
100 - 120 V 2A
200 - 240 V 1A
2A
F2
REEL MOTOR
F6
CAP. MOT
2A
F4
5A
+5V
VU LAMP
3A
1A
F8
F5
4A
F6
5A
F7
+5V
VU LAMP
3A
1A
F5
F8
R
PB-7VCA
F3
+24V
CAP. MOT
COMP SIDE
!
AC LIVE
2A
F4
R
PB-7VCA
2A
F2
REEL MOTOR
PB-7VCA
2A
F3
+18V
COMP SIDE
!
AC LIVE
F1
100 - 120 V 2A
200 - 240 V 1A
F7
Figure 2-12
Fuse Location
2 - 14
May 1992
Table 2-7
Fuse Specifications
Number
F1
F2
F3
F4
F5
F6
F7
F8
Current
Voltage
Rating
Size
Carry
2A
2A
2A
2A
3A
4A
5A
1A
125V
125V
125V
125V
125V
125V
125V
125V
5.2 x 20mm
5.2 x 20mm
5.2 x 20mm
5.2 x 20mm
5.2 x 20mm
5.2 x 20mm
5.2 x 20mm
5.2 x 20mm
110%
110%
110%
110%
110%
110%
110%
110%
Otari No.
Used For
FH9-030
FH7F020
FH9-030
FH9-030
FH7F030
FH7F040
FH7F050
FH7F010
Power Supply
Reel Motor
–18V (Slow Blow)
+18V (Slow Blow)
+5V
+24V
Capstan Motor
VU Lamp
2.7 Speed Conversion (BIII-2)
Normally, the MX-5050 BIII-2 is shipped from the factory with set at High
Speed (15/7.5 ips). If you want to change this to Low Speed (7.5/3.75 ips),
follow the steps below.
1. Remove the bottom panel to access the CONTROL PCB. Rotate the CONTROL
PCB.
2. The Speed Version Select SW1-1 is located on the CONTROL PCB. Change
the switch position to the LOW position. (Refer to § 2.3.)
3. Replace the bottom panel on the machine.
4. Make all necessary adjustments (Reproduce EQ, SRL, Bias Record EQ,
Record Level) referring to the corresponding explanation in Section 7.
NOTE: The MX-5050 MKIV-2 cannot be changed to Low Speed.
2.8 Equalization Change
The Equalization type is set to the customer's specifications at the factory.
The setting can be changed between NAB and IEC by sliding the EQUALIZER
select switch on the rear panel (Refer to § 2.3). If the setting is changed,
equalizer adjustments (§ 7.3.3 and 7.4.5) must be made.
May 1992
2 - 15
This section describes the names and functions of the controls, indicators,
and main components of the MX-5050. Drawings of the controls and
indicators are used to associate the description with the real parts on the
machine. When you have questions about any of the controls or their
functions, please refer to this section.
3.1 Tape Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2 Transport Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.3 Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.4 Amplifier Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.6 Audio Connector Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.7 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
May 1992
3-1
3.1 Tape Transport
1
2
6
3
8
4
TAPE SPEED
SET
H
SEARCH
ZERO
1
POWER
ON
M
2
3
SPEED MODE
EXT FIX VARI
7
TIME-IPS-%
H
L
S
REPEAT
CLR
PITCH CONTROL
DOWN
UP
SPEED
REEL SIZE
L
SUP
S
T.UP
S
H
L
L
CUE
EDIT
OFF
5
Figure 3-1
Tape Transport
1.
2.
3.
4.
5.
6.
7.
8.
Supply Reel Table
Take Up Reel Table
Tension Arm
Tacho Roller
Splicing Block
Pinch Roller
Capstan Shaft
Tension Arm with Safety
Switch
Numbers in brackets [ ] refer to Figure 3-1.
[1] Supply Reel Table
[2] Take-up Reel Table
The Reel Tables are supplied with reel clamps for 5" or 7" reels. For 10.5 inch
NAB reels, use the supplied reel adapter.
[3] Tension Arm
The Supply Tension Arm helps correct tape tension fluctuations due to
changes in tape pack diameter or irregularities in tape pack.
[4] Tacho Roller
The Tacho Roller is turned by tape motion and generates tacho pulses which
are used for the calculation of tape time and recognition of the tape direction.
[5] Splicing Block
When editing a tape, the tape is cut or spliced on this block.
[6] Pinch Roller
The tape is driven by the rotation of the Capstan Shaft against the Pinch
Roller.
[7] Capstan Shaft
The Capstan Shaft is directly driven by a DC servo motor which is controlled
by a quartz crystal reference in a phase-locked-loop circuit.
[8] Tension Arm with Safety Switch
The take-up tension arm is provided with a safety switch which stops the
transport when the tape becomes unthreaded from the reel or when too
much slack develops in the tape path.
3-2
May 1992
3.2 Transport Control Panel
TAPE SPEED
SET
H
SEARCH
ZERO
1
M
2
3
REPEAT
SPEED MODE
POWER
ON
EXT FIX VARI
TIME-IPS-%
H
L
S
CLR
PITCH CONTROL
REEL SIZE
SPEED
UP
DOWN
L
SUP
S
T.UP
S
H
L
L
CUE
EDIT
OFF
1
11 10
3
2
12
13
14
15
4
TAPE SPEED
SET
H
SEARCH
ZERO
1
6
7
M
2
S
3
16
17 18 19 20 21
5
TIME-IPS-%
H
L
REPEAT
CLR
8
9
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
POWER Switch
Tape Time Display
SET Button
Tape Speed Indicator
TIME·IPS·% Button
SEARCH ZERO Button
SEARCH 1, 2, 3 Buttons
REPEAT Button
CLR Button
Speed Mode Select
Button
11. Speed Mode Indicator
12. Pitch Control Knob
13. Tape Speed Select
Button
14. Reel Size Selector
Switch *
15. CUE Button
16. EDIT Button
17. RECORD Button
18.PLAY Button
19. STOP Button
20. REWIND Button
21. F.FWD Button
Figure 3-2
Transport Control Panel
Numbers in brackets [ ] refer to Figure 3-2.
[1] POWER Switch
Pressing the upper portion of the Switch turns on the machine.
[2] Tape Time Display
This 6-digit display shows the tape time in Hours, Minutes, and Seconds; the
tape speed in ips (inches per second); or the tape speed as a percentage
change from the selected play speed, as set by the TIME·IPS·% Button [5].
[3] SET Button
Pressing this button initiates Set mode, in a desired value can be entered by
using the SEARCH keys. There are two Set modes:
A.
B.
[4] Tape Speed Indicator
May 1992
Cue Point Set mode: Refer to § 4.5.1
Vari Speed Set mode: Refer to § 4.4.6
This LED indicates the selected speed.
Hi Version
Low Version (BIII-2)
Hi:
Low:
15 ips
7.5 ips
Hi:
Low:
7.5 ips
3.75 ips
3-3
[5] TIME·IPS·% Button
Pressing this button causes the Tape Time display to show, in turn, the
current tape time, the currently selected tape speed in ips, or the percentage
of change from the currently selected tape speed.
Tape Time ➔ Tape Speed (ips) ➔ Speed Change (%) ➔ Tape Time ➔ ···
When the display is showing Tape Speed, "iP" appears in the rightmost
column. Similarly, when in Speed Change is being displayed, "P" appears in
the rightmost column.
[6] SEARCH ZERO Button
Pressing this key places the MX-5050 into Search Zero mode. In Search Zero
mode the tape is moved at Fast Wind speed to the location of 00:00:00 and is
then stopped.
[7] SEARCH 1, 2, 3 Buttons
Pressing one of the illuminated SEARCH keys moves the tape to the location
stored in that SEARCH key and stops.
Storing a CUE point:
Search Operation:
Clearing a CUE point:
Refer to § 4.5.1
Refer to § 4.5.2
Refer to [9] CLR key
[8] REPEAT Button
Pressing the REPEAT key, then pressing two SEARCH keys, then pressing the
PLAY button enters the machine into Repeat mode. In Repeat mode, the
machine repeatedly plays back the tape between two selected points. Refer to
§ 4.5.6. for details on Repeat mode.
[9] CLR Button
Pressing the CLR key together with the one of the following keys works as
follows.
CLR + SET:
CLR + T-IPS %:
CLR + SEARCH 1-3:
CLR + REPEAT:
[10] Speed Mode Select Button
Exits Set mode
Tape Timer Display resets to zero
Cue Point Memory clears
Exits REPEAT mode
This button selects the tape speed for Record and Play modes. Pressing this
button changes the Speed mode as follows.
❏
FIX mode: The Capstan Motor speed is controlled by the internal crystal
oscillator. The speed setting (HI or LO) is selected by the Speed Select
button.
❏
VARI mode: When the VARI mode is selected, the tape speed is changed by ±
20% of the nominal tape speed with the Pitch Control knob.
❏
EXT mode: Tape Speed is controlled by the external speed reference signal
conveyed through the Parallel/O connector. When using a synchronizer or
resolver, set the machine to this EXT mode.
NOTE: When the Speed Mode switch is set to the EXT position, the Tape Time
display always shows tape time.
[11] Speed Mode Indicator
These indicators illuminate to show the speed mode selected with the Speed
Mode Select Button.
[12] Pitch Control Knob
When the Speed Control mode is set to the VARI mode, the Pitch Control
knob changes the tape speed in Record and Play modes. The tape speed is
variable over a range of ± 20% of the selected FIX speed in 0.01 % steps.
3-4
May 1992
[13] Tape Speed Select Button (HI/LO)
This button selects the speed setting of the machine. The following
combinations are available. The speed version is set with SW1 on the
CONTROL PCB.
Machine Type
HI
LO
Hi Version Machine
Low Version Machine
15ips
7.5ips
7.5 ips
3.75 ips
[14] Reel Size Change Switch
This switch sets the reel tension corresponding to the selected reel size.
When using a 10.5" NAB Reel, set this switch to the "L" position. When using
a reel smaller than 10.5", set the switch to the "S" position.
[15] CUE Button
Pressing this button during Fast Wind modes initiates Cue mode, in which
the tape lifters retract allowing the tape to be in contact with the Reproduce
head for audio monitoring at fast wind speed. There are two ways to enter
CUE mode: tapping the CUE button or holding the CUE button down. For
details, refer to § 4.2.1.
[16] EDIT Button
Pressing this button while in Stop mode causes the MX-5050 to enter Edit
Ready mode, in which the take-up motor is turned off and the safety switch
for the Take-up tension Arm is deactivated. Pressing the PLAY button in Edit
Ready mode, or pressing the EDIT button in Play mode, causes the MX-5050
to enter Dump Edit mode, in which the Take-up reel does not rotate causing
tape to be "dumped" from the transport.
[17] RECORD Button
When any channel is in Record Ready mode, pressing the RECORD and PLAY
buttons simultaneously enters REC mode. Unless the READY/SAFE switch is
placed at the READY position, actual recording will not take place. For Punch
In/Out Operation, refer to §4.4.2.
[18] PLAY Button
Pressing this button when the transport is in Stop mode enters the tape into
Play mode, in which the tape is reproduced at the currently selected tape
speed. Pressing the PLAY button with the RECORD button enters the
transport into Record mode.
[19] STOP Button
Pressing this button when the transport is in Record, Play, Dump Edit, Fast
Forward or Rewind mode causes the tape motion to stop.
[20] REWIND Button
Pressing this button places the transport into Rewind mode, in which the
tape moves from the Take-up reel to the Supply reel at Fast Wind speed.
[21] F.FWD Button
Pressing this button places the transport into Fast Forward mode, in which
the tape moves from the Supply reel to the Take-up reel at Fast Wind speed.
May 1992
3-5
3.3 Head Assembly
5
Figure 3-3
Head Assembly
4
1
2
3
Numbers in square brackets [ ] refer to Figure 3-3.
[1] Erase Head
The Erase Head is made of ferrite. The track width is 2 mm for the MKIV-2
and BIII2, 2.75 mm for the MKIV2E and BIII2E, and 6.3 mm for the BIII-F.
[2] Record Head
The Record Head is made of Hard Permalloy. The track width is 2 mm for the
MKIV-2 and BIII2, 2.75 mm for the MKIV2E and BIII2E, and 6.3 mm for the
BIII-F.
[3] Reproduce Head
The Reproduce Head is made of Hard Permalloy. The track width is 2 mm for
the MKIV-2 and BIII2, 2.75 mm for the MKIV2E and BIII2E, and 6.3 mm for
the BIII-F.
[4] Dummy Head (BQIII)
[5] Head Guides
3-6
These guides regulate the tape movement across the heads.
May 1992
3.4 Amplifier Panel
MKIV-8
1
CH 1
LINE
2
INPUT
MIC
REF FLUX
HIGH
CH 2
LINE
MIC
MID
20
LOW
-
10
6
3
3
1 0 1
2
PEAK
3
+
20
10
6
3
1 0 1
OUTPUT
CH1
2
SRL
CH2
PEAK
3
-
+
VU
5
VU
NAB
IEC
SRL
EQUALIZATION
RECORD
CH1
SEL-REP
CH2
CH1
12
13
1.
2.
3.
4.
5.
6.
7.
8.
Input Level Knobs
Vu Metes
Peak Indicator
SRL Indicators
Output Level Knob
SRL Switch
MONITOR Button
Test Oscillator Button
CH2
RECORD BIAS
CH1
CH2
CH1-RECORD
HIGH
10 15 14
LOW
RECORD LEVEL
EQ-CH2
HIGH
LOW
CH1
PHONES
TEST OSC
1KHz
CH2
9
10KHz
8
CH1-MONITOR-CH2
SOURCE
TAPE
6
7
11
9.
10.
11.
12.
13.
14.
15.
Phone Jack
SEL-REP Mode Button
SEL-REP Mode Indicator
RECORD Ready Button
RECORD Mode Indicator
Equalizer Indicator
Reference Flux Level Indicator
MKIV-2
BIII
Figure 3-4
Amplifer Panel
May 1992
3-7
Numbers in square brackets [ ] refer to Figures 3-4 and 3-5.
[1] Input Level Knobs
The outer knob adjusts the line input signal level. The inner knob adjust the
microphone input signal level.
[2] VU Meters
The VU meters indicate the record and reproduce levels of the associated
channels. The VU meters illuminate when the machine is turned on.
[3] Peak Level Indicators (LED)
Each VU meter has a PEAK level indicator which illuminates when the signal
reaches a level equivalent to 1040 nWb/m.
[4] SRL Indicator
This illuminates when the SRL button is pressed.
[5] Output Level Knob
The outer knob adjusts CH1 output signal level. The inner knob adjusts CH2
output signal level.
[6] SRL Switch
This switch selects the Standard Reference Level (SRL) of the output level.
When this switch is pressed, the output level is set to the SRL (factory
setting: +4dB).
[7] Monitor Button
This button selects the monitor signal source. When this button is set to
SOURCE position, all the OUTPUT connectors and VU Meters receive the
signal present at the INPUT connector. When this button is set to TAPE
position, the signal reproduced with the Repro Head is output.
[8] Test Oscillator Buttons
Pressing one of these buuttons activates the test oscillator. The selectable
oscillator frequencies are 1kHz and 10kHz.
[9] Monitor Phone Jack
This is the monitoring Head Phone Jack. Load Impedance is 8 Ω
[10] SEL-REP Mode Button
If the Monitor button is set to TAPE position and the SEL-REP Mode button is
pressed, all the OUTPUT connectors and VU Meters receive signals
reproduced by the Record head.
[11] SEL-REP Indicator
This indicator illuminates when the SEL-REP mode is selected.
[12] RECORD READY Buttons
When these buttons are pressed, the machine enters into READY mode. In
READY mode, the machine enters Record mode when the REC and PLAY
buttons are pressed. If these buttons have not been depressed, the machine
is set to SAFE. In SAFE mode, the machine cannot enter Record mode even if
the REC and PLAY buttons are pressed.
[13] RECORD Mode Indicator
This indicator illuminates when the machine is set to Record Ready mode.
[14] EQ indicator
This indicator illuminates to show the selected EQ setting.
[15] REF FLUX indicator
This indicator illuminates to show the selected Reference Flux Level.
3-8
May 1992
3.6 Audio Connector Panel
8 9
1
10
PARALLEL
CH 1
OUTPUT
CH 2
LINE
LOW
EQUALIZATION
HIGH
IEC
NAB
6
7
REF FLUX
LOW
MID
CH 1
INPUT
OdB -2OdB OFF
4
5
Line Output Connector
Line Input Connector
Mic Input Connector
Mic Attenuator Switch
REF FLUX Switch
Equalizer Switch
Output Level Switch
Ground Terminal
Parallel I/O Connector
Power Connector
I/O
CH 2
LINE
CH 1
OUTPUT
CH 2
LINE
CH 1
INPUT
CH 2
MIC
CH 1
INPUT
POWER
OUTPUT LEVEL
LOW
CH 2
MIC
MIC ATTENUATOR
HIGH
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
PARALLEL
CH 1
INPUT
POWER
OUTPUT LEVEL
GROUND
3
I/O
CH 2
LINE
GROUND
2
HIGH
EQUALIZATION
IEC
NAB
REF FLUX
LOW
MID
HIGH
MIC ATTENUATOR
OdB -2OdB OFF
Figure 3-5
Audio Connector Panel (BIII)
May 1992
3-9
2
3
LINE INPUT
CH 2
CH 1
MIC INPUT
CH 2
CH 1
1
LINE OUTPUT
CH 1
CH 2
OUTPUT LEVEL
LOW HIGH
EQUALIZATION
IEC NAB
7
6
REF FLUX
LOW MID HIGH
MIC ATTENUATOR
OdB-2OdB OFF
5
4
PARALLEL
9
LINE OUTPUT
CH 1
CH 2
OUTPUT LEVEL
LOW HIGH
EQUALIZATION
IEC NAB
LINE INPUT
CH 2
CH 1
REF FLUX
LOW MID HIGH
PARALLEL
MIC INPUT
CH 2
CH 1
MIC ATTENUATOR
OdB-2OdB OFF
I/O
POWER
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
I/O
POWER
GROUND
10
8
Line Output Connector
Line Input Connector
Mic Input Connector
Mic Attenuator Switch
REF FLUX Level Select Switch
Equalizer Select Switch
Output Level Select Switch
Ground Terminal
Parallel I/O Connector
Power Connector
GROUND
Figure 3-6
Audio Connector Panel (MKIV-2)
3 - 10
May 1992
The numbers in bracket [ ] refer to Figures 3-7 and 3-8.
[1] LINE OUTPUT Connector
These XL type connectors are for audio output. See §2.2.2 for pin
assignment.
[2] LINE INPUT Connector
These XL type connectors are for audio input. See §2.2.2 for pin assignment.
[3] Microphone Input Connector
These XL type connectors are for microphone input.
[4] Microphone Attenuator Switch
When this switch is set to the –20dB position, this switch attenuates the
microphone input level by 20dB. If attenuation is not necessary, set this to
0dB. When this switch is set to the OFF position, the MIC input is not active.
[5] REF FLUX Switch
This switch selects the Reference Flux Level from L(185)/M (250)/H (320
nWb/m).
[6] Equalizer Switch
This switch changes the Equalizer setting to IEC or NAB.
[7] Output Level Switch
This switch selects the output level from +4dBu/-16dBu.
[8] GROUND Terminal
This is the auxiliary ground terminal. Connect equipment not connected to the
AC earth to this terminal.
[9] POWER Connector
This connector is for the supplied AC power cable.
[10] PARALLEL I/O Connector
This is the OTARI standard Parallel I/O connector. This 37 pin connector
includes ports for Transport Control Command Status Tally Signal and
External Capstan Speed Control Signal. For details refer to § 3.7.
May 1992
3 - 11
3.7 Connector Pin Assignment
Table 3-1
Parallel I/O Pin Assignment
No. Signal Name
1
2
3
4
5
6
9
10
11
12
13
14
16
17 1
18
19
20 2
21 3
22 3
23
24
25
31
32
33
34
35
36
37
1
Signal Level
IN/OUT
RECORD SW
LOW
PLAY SW
LOW
STOP SW
LOW
F.FWD SW
LOW
REWIND SW
LOW
LIFTER DEFEAT
LOW
SAFETY SW SHUT OFF LOW
RECORD TALLY
LOW
PLAY TALLY
STOP TALLY LOW
F.FWD TALLY LOW
REWIND TALLY
LOW
SIGNAL GROUND
LOW
TACHO PULSE
FWD/REV
LOW/HI
9.6kHz (FIX)
CAP.CLOCK
SPEED A
LOW/HI
SPEED B
LOW/HI
PITCH ENABLE
LOW
PITCH TALLY
LOW
REC. READY LOW
SENSOR TALLY
LOW
REHEARSE
LOW
5V ± 10%
AUX. POWER
AUX. POWER
POWER GND
POWER GND
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
OUT
OUT
IN
OUT
OUT
OUT
IN
Function
RECORD Switch
PLAY Switch
STOP Switch
F.FWD Switch
RWD Switch
Lifter Defeat Switch
Safety Switch
Record Tally
Play Tally
Stop Tally
F.FWD Tally
RWD Tally
Signal GND
Tacho Pulse Output
Tape Direction
9.6 kHz Output
Ext Speed CNT Input
EXT. Speed CNT Command
EXT CNT Tally
REC READY Tally
Proximity Sensor
REC Rehearsal Command
5V (max 150 mA)
Unreg. Power Output
(24V ~ 40V Max. 500mA)
Power GND
Power GND
Tacho pulse
Tacho Pulse Rate
15 ips
7.5 ips
3.75 ips
120 pulse/sec
60 pulse/sec
30 pulse/sec
Tacho Pulse Width
Minimum 100µsec
2
CAP. CLOCK
Capstan Ext. Speed Control Input Clock
Rated Tape Speed: 9.6kHz
Allowable Frequency Range: 4.8 to 19.2kHz
Duty Cycle: 40 to 60 %
3
Table 3-2
Connector Pin 21,22
SPEED A, SPEED B
TAPE SPEED
15 ips
7.5 ips
SPEED A
SPEED B
High
Low
Low
High
NR Remote Connector (MKIV-8 Option)
3 - 12
May 1992
Table 3-3
Remote Control Connector (MKIV-8 Option)
May 1992
CH
PIN
CH
PIN
CH1
CH2
CH3
CH4
1 - 14
2 - 15
3 - 16
4 - 17
CH5
CH6
CH7
CH8
5 - 18
6 - 19
7 - 20
8 - 21
3 - 13
Section 4 Operation
This section contains, first, a list and accompanying brief explanation of each
of the operating conditions (or modes) of the MX-5050, and second, a
detailed explanation of each operation or activity associated with the
operation of the MX-5050 Tape Recorder. Please read both parts of this
Section when first becoming familiar with the machine, and then refer to
them whenever more information about the operation of the machine is
required.
4.1 Operation Mode Reference Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.1 Transport Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.2 Audio Channel Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.3 Operating the MX-5050 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.3.1 Placing Reels on the Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.3.2 Threading the Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.4 Operation of the Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
Playing Back the Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Recording the Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Sel-Rep Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Fast Wind and CUE monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Tape Editing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Using the Pitch Control Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
4.5 Locator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
Storing Tape Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Search Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Search Play Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Search Zero Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Search Start Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repeat Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-11
4-11
4-12
4-12
4-12
4-13
4.6 Test Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
May 1992
4-1
Section 4 Operation
4.1 Operation Mode Reference Tables
Table 4-1
Transport Modes
MODE
CONTROL
EXPLANATION
Stop
STOP
Tape motion stops.
Play
PLAY
Tape moves from Supply to Take-up at the currently
selected speed.
F.Fwd
F.FWD
Tape moves from Supply to Take-up at Fast Wind speed.
Rewind
REWIND
Tape moves from Take-up to Supply at Fast Wind speed.
Record *
RECORD or RECORD + PLAY
Any channel in Record Ready begins to record.
Rehearse
REHEARSE
The track in Ready mode changes to INPUT monitor
when the Punch In is performed.
Edit Ready
EDIT in Stop mode
Transport is ready for Edit or Edit Play mode.
Edit Play
PLAY in Edit Ready mode
Tape moves towards Take-up reel but Take-up reel does
not turn (Dump Edit).
Cue
CUE in Rewind or F.Fwd mode
Lifters will be retracted to allow audio to be monitored.
Vari Speed
Speed Mode switch to Vari
Tape speed is controlled by the Pitch Control.
* Selected with SW 1-2 on Transport Control PCB.
Table 4-2
Audio Channel Modes
MODE
CONTROL
EXPLANATION
Ready
READY/SAFE switch to READY
The selected channel will enter Record when the
RECORD and PLAY buttons are pressed.
Safe
READY/SAFE switch to SAFE
The selected channel will not enter Record.
Input Monitor
Monitor Select switch to INPUT
The signal at the OUTPUT connector for that channel is
present the signal at the INPUT connector.
Sel·Rep Monitor
Monitor Select switch to SEL·REP
The signal at the OUTPUT connector is the signal on tape
reproduced by the Record Head.
Repro Monitor
Monitor Select switch to REPRO
The signal at the OUTPUT connector is the signal on tape
reproduced by the Reproduce Head.
MODE
CONTROL
EXPLANATION
Set mode
SET button
Tape locations can be entered for Cue Points using the
ZERO, 1, 2, 3, REPEAT mode and CLR buttons.
Repeat mode
REPEAT + two SEARCH buttons
Tape plays from 1st to 2nd Cue Points, then rewinds to
1st and repeats.
Search
stops.
SEARCH 1/2/3
Tape is moved to the Cue Point at Fast Wind speed and
Search Zero
SEARCH ZERO
Tape is moved to 0:00:00 at Fast Wind speed and Stops.
Search Play
PLAY + SEARCH 1/2/3
Tape is moved to the Cue Point at Fast Wind speed where
it enters Play.
Table 4-3
Auto Locator Modes
4-2
May 1992
Section 4 Operation
4.2 Modes of Operation
4.2.1 Transport Modes
❏
Play mode: In Play mode, the tape moves from Supply reel to Take-up reel at
the currently selected tape speed. To enter Play mode, press the PLAY
button. The Lamp on the PLAY button will become illuminated. Play mode
can be entered from any mode except Edit Ready and Search modes.
❏
Fast Forward mode: In Fast Forward mode, the tape moves from the Supply
reel to the Take-up reel at Fast Wind speed. To enter Fast Forward mode,
press the F.FWD button. The Lamp on the F.FWD button will become
illuminated. Fast Forward mode can be entered from Stop, Play, Rewind and
Record modes.
❏
Rewind mode: In Rewind mode, the tape moves from the Take-up reel to the
Supply reel at Fast Wind speed. To enter Rewind mode, press the REWIND
button. The Lamp on the REWIND button will become illuminated. Rewind
mode can be entered from Stop, Play, Fast Forward and Record modes.
❏
Record mode: To enter Record mode, press the RECORD and PLAY buttons
when a channel is in Record Ready mode, or if it is selected to do so, press
the RECORD button while the machine is in Play mode. The Lamp on the
RECORD button will steadily illuminate when the MX-5050 is in Record
mode.
❏
Edit Ready mode: To enter Edit Ready mode, press the EDIT button while in
Stop mode. The Lamp on the EDIT button will flash when the MX-5050 is in
Edit Ready mode. Edit Ready mode can be entered even if there is slack in
the tape path.
❏
Edit Play mode: To enter Edit Play mode, press the PLAY button while in Edit
Ready mode. The pinch roller will engage the capstan, the Take-up reel will
not rotate, and the tape will be spilled from the right side of the transport. To
enter Edit Play mode while in Play mode, press the EDIT button. The Take-up
reel will stop rotating and the tape will be spilled from the right side of the
transport.
❏
Cue mode (Lifter Defeat): In Cue (or Lifter Defeat) mode, the tape lifters will
be retracted and the audio attenuated allowing the signals on the tape to be
monitored while tape is moving at Fast Wind speed. To enter Cue mode,
press the Cue button while in Fast Forward or Rewind mode. There are two
ways to enter the CUE mode as follows.
Tapping the CUE button causes the Tape Lifter to remain retracted until the
CUE button is pressed again. This monitoring is convenient when monitoring
the tape for a long time.
Holding the CUE button pressed causes the tape lifter to remain retracted as
long as the button is held pressed.
May 1992
4-3
Section 4 Operation
4.2.2 Audio Channel Modes
4-4
❏
Record Ready mode: When the RECORD and PLAY buttons are pressed, any
channel which is in Record Ready will begin to Record. To place a channel
into Record Ready mode, press the RECORD mode button for that channel.
The Record mode indicator will illuminate and the indicator on the RECORD
button will flash.
❏
Record Safe mode: In Record Safe mode, Record mode cannot be entered.
To place a channel in Record Ready mode into Record Safe mode, press the
RECORD mode button for that channel to the SAFE postion (not depressed).
The Record mode indicator(s) will extinguish. When the Record mode
indicator is extinguished, that channel is in Record Safe mode.
❏
Input Monitor mode: In Input Monitor mode, the signal at the OUTPUT
connectors, VU Meters, PHONES connector, and Monitor Speaker is the
signal present at the INPUT connector for that channel. To place a channel
into Input Monitor mode, set the Monitor button for that channel to SOURCE
position (not depressed).
❏
Sel-Rep Monitor mode: In Sel·Rep (Selective Reproduce) Monitor mode, the
signal at the OUTPUT connectors, VU Meters, PHONES connector, and
Monitor Speaker is the signal on tape reproduced by the Record Head for that
channel. To place a channel into Sel·Rep Monitor mode, press the SEL·REP
Monitor button for that channel.
May 1992
Section 4 Operation
4.3 Operating the MX-5050
4.3.1 Placing Reels on the Machine
❏
Using 5" or 7" EIA Reels
1. Turn the Reel Clamp portion of the Reel Spindle until it lines up with the three
Reel Drive Pins on the Reel Table.
2. Place the reel on the Reel Table so that the Reel Drive Pins are inserted into
the slots in the reel.
3. Lift and turn the Reel Clamp portion of the Reel Spindle 60 degrees (until it
clamps the reel in place).
Reel Spindle
Reel Drive Nail
❏
Using 10.5" NAB Hub Reels
2. Place the Reel Adapter on the Reel Table and lift and turn the Reel Clamp
portion of the Reel Spindle 60 degrees (until it clamps the Adapter in place.)
3. Place the Reel on the Reel Adapter and lift and turn the upper portion of the
Adapter until it locks the reel in place.
Reel Adapter
AEG Adapter
❏
Using AEG (or DIN) Hubs (Optional)
2. Place the Reel Adapter on the Reel Table and lift and turn the Reel Clamp
portion of the Reel Spindle 60 degrees (until it clamps the Adapter in place).
3. Place the hub of tape on the Adapter and rotate the Adapter 90 degrees to
lock the hub in place.
May 1992
4-5
Section 4 Operation
4.3.2 Threading the Tape
1. Mount an empty reel on the Take-up side and mount a reel of tape on the
Supply side.
NOTE: Select the reel diameter by pressing the REEL SIZE T.UP S/L and REEL
SIZE SUP S/L buttons after mounting the reels.
2. Thread the tape from the Supply reel to the Take-up reel as shown in Figure
4-1 and turn the Take-up reel clockwise to remove any slack from the tape
path.
TAPE SPEED
SET
H
SEARCH
ZERO
POWER
ON
1
M
2
3
SPEED MODE
EXT FIX VARI
TIME-IPS-%
H
L
S
REPEAT
CLR
PITCH CONTROL
DOWN
UP
SPEED
REEL SIZE
L
SUP
S
T.UP
S
H
L
L
CUE
EDIT
OFF
Figure 4-1
Tape Threading
Note: When threading a tape onto the machine, be sure that the
tape is threaded correctly (see the enlarged figure to the right).
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@@@@@@@@e?
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4-6
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?@@
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?@@@@@@@@
May 1992
Section 4 Operation
4.4 Operation of the Transport
4.4.1 Playing Back the Tracks
1. Set both Record mode buttons to the SAFE position (not depressed).
2. Press the Monitor button to the TAPE position.
3. Press the PLAY button to start Play mode.
4. Press the STOP button to stop Play mode.
4.4.2 Recording the Tracks
1. Press the RECORD mode button for the channels to be set to the READY
position.
2. Set the MONITOR buttons of the channels to be recorded to the SOURCE
position (not depressed).
3. Adjust the Input Level Control of each channel so that the VU meter indicates
0 VU at the reference input level. (With this level setting, the peak indicator
will illuminate occasionally.)
4. Press the CLR and T-IPS-% keys to clear the Tape Timer display.
5. Press the PLAY and RECORD buttons together to place the transport into
Record mode. The RECORD and PLAY buttons on the transport illuminate.
6. In RECORD mode, the recorded signal can be monitored by pressing the
MONITOR button to the TAPE position.
NOTE: When a channel is set to SEL REP mode, the channel can not enter
RECORD mode. Confirm that the SEL REP button of the recording channel is
not pressed.
NOTE: While the machine is in PLAY mode, pressing the RECORD button
places the machine in Record mode. This operation is called Punch In. Punch
In operation is selected from the following methods with SW1-2 on the
REC/REP AMP PCB Assembly.
❏
Pressing the RECORD button in PLAY mode enters Record mode.
❏
Pressing the RECORD and PLAY buttons together while in Play mode enters
the Record mode.
NOTE: Pressing the PLAY button while the machine is still in Record mode
exits the Record mode and enters the Play mode without stopping the
machine. This operation is called Punch Out. Punch Out operation is selected
from the following methods with SW1-3 on the REC/REP AMP PCB
Assembly.
May 1992
❏
Pressing the PLAY button while in RECORD mode exits the Record mode and
enters the Play mode.
❏
Pressing the STOP button while pressing the RECORD button exits Record
mode and enters Play mode.
4-7
Section 4 Operation
4.4.3 SEL-REP Recording
SEL-REP operation means that the tape is reproduced with the Record Head
instead of being reproduced with the Reproduce Head. With this operation,
the signal reproduced with the Record head is recorded to the other track
without time delay. The following is the procedure of the SEL-REP operation.
1. Rewind the tape to the starting point of the SEL-REP operation.
2. Press the RECORD READY button of the recording channel to place it in the
READY position.
3. Set the MONITOR button of the channel to to be recorded to the SOURCE
position (not depressed). Set the Monitor button of the channel to be
monitored to TAPE.
4. Adjust the Input Level knob of each channel so that the VU meter indicates
0VU. (With this level setting, the peak indicator sometimes illuminates.)
5. Press the SEL-REP mode button of the channel being monitored to the
SEL-REP position.
6. Press the PLAY button to begin playback.
When the RECORD button is pressed at the overdubbing point, the channel
set to READY is changed to INPUT mode and recording begins.
7. Press the STOP button to stop recording.
When ready to Punch Out, press the PLAY button at the end of the recording.
4.4.4 Fast Wind and Cue Monitor
Pressing the F.FWD button places the machine into fast wind mode. Pressing
the RWD button places the machine in rewind mode. The machine can enter
these modes from any mode other than EDIT mode. When the machine is in
F.FWD or RWD mode, the tape is normally lifted away from the heads. To
monitor the signal on the tape while fast winding press the CUE button.
When the CUE button is pressed the lifters are retracted and the tape comes
into contact with the heads. There are two methods of operating the CUE
button as described below.
❏
Tapping the CUE button
Tapping the CUE button momentarily retracts the lifters and allows the tape to
make contact with the heads so that the tape can be monitored. Tapping the
CUE button again raises the lifters.
❏
Holding the CUE button down
Holding the CUE button down retracts the lifters for as long as the button is
held down.
4-8
May 1992
Section 4 Operation
4.4.5 Tape Editing
1. Move the tape at the beginning of the edit section. When the tape
reaches to the editing point, rotate the reel by hand to accurately locate
the editing point, and finally place the editing point to the reproduce
head.
2. Press the EDIT button to enter the EDIT Ready mode. The EDIT button
blinks to show that the machine is in Edit Ready mode.
3. Mark the point at the REPRO Head with a marker pen.
4. Draw out the tape from the Head Assembly. Place the tape on the
Splicing Block. Cut the tape along with the slot on the Splicing Block.
5. While holding the unnecessary part of the tape, thread the tape between
the Pinch Roller and Capstan Shaft.
6. Press the PLAY button and the tape will spill off from the right end of the
transport to the floor. The EDIT and PLAY buttons illuminate to tell the
machine is in EDIT mode.
7. When the tape reaches to the end of the edit section, press the STOP
button to stop the machine. Repeat step 3 and 4 and splice the tape until
the desirable edited tape is obtained.
Beginning of the edit section
CUT
End of the edit section
CUT
Figure 4-2
Editing a Tape
May 1992
4-9
Section 4 Operation
4.4.6 Using the Pitch Control Feature
The speed of the tape can be changed over a range of ± 20%as it is being
recorded or played. This feature makes it possible to compress or extend
material to fit it into a time slot, or to change the pitch for special effects, etc.
To manually adjust the speed of the MX-5050.
1. Press the SPEED MODE select button until the VARI mode indicator
illuminates.
2. Use the Pitch Control knob to vary the capstan speed as desired. Turning the
knob counterclockwise decreases the speed, turning it clockwise increases
the speed. The pitch can be changed in 0.01% increments.
The MX-5050 allows the last Vari Speed setting to be stored in memory for
recall the next time the Vari Speed feature is used.
❏
Presetting the Vari Pitch Value in FIX Speed mode
1. Change the Tape Time Display to Speed Change indication (%) by pressing
the TIME IPS % button.
2. Press the SET button and display the desired vari pitch value on the display
by pressing the SEARCH and CLEAR keys. The display changes as follows.
Table 4-4
Vari Pitch Preset
Key
Changing Item
Change
REPEAT
SEARCH ZERO
SEARCH 1
SEARCH 2
SEARCH 3
+/10% column
1% column
0.1% column
0.01% column
-/no display
no display 1 2
0-9
0-9
0-9
3. Set the Speed Mode Switch to the VARI Position. The machine starts
reproducing at the set vari speed.
❏
Recalling the Previous Vari Pitch Speed Setting
1. Change the Tape Time Display to Speed Change indication (%) by pressing
the TIME IPS % button.
2. Display the previous vari pitch speed setting by pressing the SET button.
3. If no change is required, set the Speed Mode Switch to the Vari position. The
capstan motor starts rotating at the vari pitch speed setting.
4 - 10
May 1992
Section 4 Operation
4.5 Locator Operation
The MX-5050 Series tape recorders feature a built-in Auto Locator which has
three cue point memories, a zero location memory, and the ability to repeat
play between any two selected tape locations.
4.5.1 Storing Tape Locations
There are two ways to store tape locations into the locator memory: The tape
locations can be captured "on the fly", or can be entered in SET mode.
❏
Capturing Tape Locations
Pressing an unilluminated SEARCH key while reproducing the tape causes
that tape location to be stored in the cue point memory of that SEARCH key.
The LED of the key illuminates to indicate that a CUE point has been stored.
To clear the CUE point, press the CLR button and the corresponding SEARCH
key.
❏
Cue Point Set Mode
In SET mode, the desired tape location can be displayed on the display by
using the SEARCH ZERO, SEARCH 1/2/3, REPEAT and CLR keys, and can be
stored in the SEARCH CUE points.
1. To enter the machine into the SET mode, press the SET key. The indicator on
the SET key illuminates and the decimal points on the display start to blink.
2. After placing the machine into the SET mode, enter the desired tape time with
the following keys.
Table 4-5
Cue Point Set Mode
KEY
CHANGING ITEM
CHANGE
SEARCH ZERO:
SEARCH1:
SEARCH2:
SEARCH3:
REPEAT:
CLR:
10 Hour
1 Hour
10 Minute
1 Minute
10 Seconds
1 Second
0,1,2,0-9
0-5
0-9
0-5
0-9
3. After the desired tape time is indicated on the display, press the SEARCH key
while pressing the SET key to store the tape location on the display as a CUE
point.
4. To exit from the SET mode, press the CLR key while pressing the SET key.
4.5.2 Search Mode
To enter Search mode, press any illuminated SEARCH 1/2/3 button. In this
mode, the machine will move the tape at Fast Wind speed to the Cue Point
and stop. During Search mode, the tape location will be shown on the display
briefly, and the button indicator will flash.
May 1992
4 - 11
Section 4 Operation
4.5.3 Search Play Mode
To enter Search Play mode, press the PLAY button while in Search mode. The
Lamp on the PLAY button will flash, and the MX-5050 will enter Play mode
when the tape reaches the Cue Point.
4.5.4 Search Zero Mode
To enter Search Zero mode, press the SEARCH ZERO button. The tape will
move at Fast Wind speed to the location corresponding to 0:00:00 on the
Tape Time display and stop. During the Search the indicator in the SEARCH
ZERO button will flash.
4.5.5 Search Start Mode
When SW2-1 on the Transport Control PCB Assembly is in the On position
and SW2-2 is in the Off position, the Search Start function is assigned to the
SEARCH 3 key.
In this mode, whenever the PLAY button is pressed, that location is stored in
Cue Point memory 3. Pressing the SEARCH 3 key moves the tape to the point
where the PLAY button was last pressed.
4 - 12
May 1992
Section 4 Operation
4.5.6 Repeat Mode
The Tape Timer has a REPEAT function which repeatedly plays back the tape
between two selected points. When the tape reaches the end of the repeat
loop, the machine rewinds to the beginning of the loop and starts playing
back again.
❏
To enter a Repeat Loop
1. Press the REPEAT key. (The LED on the key starts flashing.)
2. Press two SEARCH keys which have stored CUE points. (The REPEAT key
illuminates steadily. The SEARCH keys start to flash.)
3. If the tape is stopped between the two CUE points, pressing the PLAY button
starts Repeat mode. If the tape is stopped outside of the Repeat Loop, the
machine automatically enters Fast Forward or Rewind mode and moves to
the beginning of the Repeat Loop and stops.
4. To exit from the Repeat mode, press the REPEAT key while pressing the CLR
key.
NOTE: In REPEAT mode, the PLAY, RECORD, STOP, RWD, F.FWD and
REHEARSE buttons still function. The beginning and end points are used as
Guard points beyond which the tape cannot go.
Pressing the REPEAT key again while in Repeat mode causes the REPEAT key
indicator to flash, and new CUE points can be selected for the beginning and
ending points of the Repeat Loop.
F.FWD
RWD
RWD
START
PLAY
END
REPEAT LOOP
4.6 Test Oscillator
The MX-5050 includes a two-frequency Test Oscillator for use when
recording reference tones for level matching or alignment purposes.
1. Press the desired Oscillator Frequency button (1kHz or 10kHz) to activate the
internal Test Oscillator.
2. The test signal output from the oscillator is supplied to all channel inputs
simultaneously. The signal input level can be adjusted by using the input level
knob.
May 1992
4 - 13
The maintenance procedures described in this section should be performed
at regular intervals. Cleaning and demagnetizing the heads and tape path
should be performed before each recording session, and must be performed
before any electronic alignments are performed. Lubrication should be
performed after 1000 hours of operation or after 6 months, whichever comes
first.
5.1 Maintenance Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.2 Demagnetizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.3 Cleaning the Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.4 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
May 1992
5-1
5.1 Maintenance Scheduling
Routine maintenance is necessary to keep the MX-5050 in peak operating
condition. The following is a chart for a suggested maintenance schedule.
Table 5-1
Maintenance Time Table
Adjustment Item
Before Each Session Every 3 to 6 months
Demagnetizing
Cleaning
Lubrication
Pinch Roller Pressure
Equalizer (REP, REC)Setting
REP, REC Level
Bias Adjustment
Table 5-2
Tools Required for Maintenance
✓
✓
✓
✓
✓
✓
✓
Section
§ 5.2
§ 5.3
§ 5.4
§ 6.5
§ 7.3.3, § 7.4.4
§ 7.3.2, § 7.4.3
§ 7.4.1
Tool Names
Parts No.
Used for
OTARI Cleaningn Kit
Isopropyl Alcohol
ZA-51B
Included in
ZA-51B
Any
PZ9E003
Cleaning the Head
Cleaning the Tape Guide, Capstan
Pinch Roller, Capstan Shaft
Demagnetizing the Head, Guide
Lubirication for Capstan Motor
Head Eraser
Lubrication Oil
5.2 Demagnetizing
Demagnetizing (sometimes called degaussing, although that term is more
often applied to bulk tape erasure) is a necessary procedure and should be
performed before every recording session and prior to performing any
alignments. Demagnetizing should always be done with extreme caution.
DEMAGNETIZING CAUTION: To avoid damaging the MX-5050, always make
sure the POWER switch is off before proceeding. The AC field created by the
demagnetizer is extremely powerful and could seriously damage the
electronics if they are on. Make sure that all recording tapes, especially
alignment tapes, are removed from the vicinity of the MX-5050.
Never turn the power to the demagnetizer on or off unless it is at least
1 meter (3 feet) away from the MX-5050. When the demagnetizer is turned
on or off, an extremely strong moving magnetic field is created which could
possibly place a permanent magnetic charge on parts of the machine. The
demagnetizer would not be powerful enough to remove these charges under
normal circumstances, and the parts might have to be removed and
discarded. Use only a demagnetizer with high flux density; inexpensive "Hi-Fi"
type demagnetizers can leave residual fields that will cause more harm than
benefit.
1. Turn off the MX-5050 POWER switch.
DEMAGNETIZER
HEAD
2. With the demagnetizer at least 1 meter (3 feet) from the MX-5050, plug the
demagnetizer into the AC mains and turn it on.
3. Slowly move the demagnetizer toward the Supply Tension Arm until the tip is
approximately 3 mm (1/8") away from the arm.
Figure 5-1
Demagnetizing the Head
5-2
May 1992
4. Slowly move the tip of the demagnetizer up and down along the arm so that
the entire surface is exposed to the demagnetizing field. Do not touch any
part of the MX-5050 with the demagnetizer.
5. Slowly move the demagnetizer at least 1 meter (3 feet) away from the
MX-5050.
6. Working from left to right repeat Steps 3, 4, and 5 for each of the following
metal parts in the tape path:
A.
B.
C.
D.
E.
F.
Supply Tension Arm
Supply Tape Guide
Supply Tape Lifter
Erase Head
Center Tape Guide
Record Head
G.
H.
I.
J.
K.
Take-up Tape Lifter
Reproduce Head
Take-up Tape Guide
Capstan Shaft
Take-up Tension Arm
7. When all the above parts have been demagnetized, slowly move the
demagnetizer at least 1 meter (3 feet) away from the MX-5050 and turn it off
or unplug it.
5.3 Cleaning the Tape Path
It is extremely important to clean the entire tape path regularly. Oxide and dirt
will be shed from the tape and accumulate on these parts, causing a build-up
that can degrade audio performance, cause slippage and undue wear on the
tape.
CAUTION: Never use any metallic item or abrasive to clean the heads or any
other tape guidance parts. Never use spirits, lacquer thinner, acetone or other
solvents on the tape heads. Rubbing alcohol should be avoided since it
contains oil that will leave a residue. The entire tape path should be cleaned
and demagnetized before performing any adjustments.
1. Turn off the machine.
2. Lift up the head cover.
3. Moisten a cotton swab in pure isopropyl alcohol, and wipe the entire surface
of the Supply Tension Arm. Allow the Tension Arm to dry by evaporation.
4. Moisten additional swabs and clean the following parts:
A.
B.
C.
D.
E.
F.
G.
COTTON SWAB
Supply Tension Arm
Tacho Roller
Supply Tape Guide
Supply Tape Lifter
Erase Head
Center Tape Guide
Record Head
H. Take-up Tape Lifter
I. Reproduce Head
J. Take-up Tape Guide
K. Capstan Shaft
L. Pinch Roller
M. Take-up Tension Arm
CAUTION: Do not use alcohol moistened swabs to clean the Pinch Roller. To
avoid embedding dust and lint particles in the surface of these rollers, use
only an alcohol moistened Lint-Free cloth to gently clean the rollers.
HEAD
Figure 5-2
Cleaning the Head
May 1992
5-3
5.4 Lubrication
The Capstan Motor in MX-5050 machines utilizes an Oilite bearing at the
front end, which requires lubrication.
Use only Otari oil P/N PZ9E003.
To lubricate the Capstan Motor bearing, follow these steps:
1. Remove the pinch roller cap by removing the screw on it.
2. Remove the pinch roller from the pinch roller shaft.
3. Remove two hex socket head screws on the head housing cover.
4. Remove the Tape Guide at the take up side. Remove the two screws holding
the Rear Head Escutcheon.
5. Remove the dust cap on the Capstan Motor with a pair of tweezers. Refer to
Figure 5-3.
6. Apply 2 or 3 drops of oil to this felt collar. Do not over lubricate.
7. Wipe off any excess oil and install the dust cap, Rear Head Escutcheon, head
housing cover, pinch roller and pinch roller cap in that order.
Rear Head
Escutcheon
Pinch Roller
Head Housing
Tape Guide
Dust Cap
DUST CAP
LUBRICATION OIL
PZ9E003
FELT PAD
Figure 5-3
Lubrication
5-4
May 1992
This section presents information and procedures for Transport Adjustment
and Parts Replacement, and Adjustment after Replacement. Some parts
require adjustment after replacement.
6.1 Transport Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.2 Brake Torque Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.3 Tape Lifter Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.4 Capstan Motor Adjustment and Pitch Control Adjustment . . . 6-5
6.5 Pinch Roller Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6.6 Tape Speed Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6.7 Reel Table Height Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
6.8 Head Assembly Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6.9 Head Position Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
May 1992
6-1
6.1 Transport Access
The PCB Assemblies and main transport parts are located inside the
machine. Therefore, to adjust these parts, certain panels must first be
removed. Refer to § 2.4 for instructions on accessing these parts.
6.2 Brake Torque Adjustment
The brake adjustment is performed with the machine turned off.
The brake torque values are different for the supply side and take up side.
Since the torque values for both sides are adjusted at one time, the adjusted
torque is the best compromise for both sides.
Necessary Tools
Table 6-1
Necessary Tools
10.5" NAB Reel
String (2m)
Spring Scale (500g)
1. Turn off the power to the machine.
2. Place an empty NAB reel (10") on the Supply Reel Table.
3. Wind a piece of string a few turns counterclockwise on the hub of the NAB
reel.
4. Attach the spring scale to the end of the string.
5. Hold the spring scale upright as shown in Figure 6-1.
6. Pull on the scale slowly to make the reel rotate counterclockwise (direction B
in Figure 6-1). While making sure that the cable does not rub against either
flange, note the scale reading.
7. Wind the string clockwise direction on the supply reel.
A
B
B
A
Figure 6-1
Brake Torque Measurement
6-2
May 1992
8. Repeat steps 4 ~ 6 for a clockwise reading on the supply side. The readings
should fall within the range listed in the table below.
Table 6-2
Brake Tension Values
MX-5050BIII
A
B
100 ~ 125g (3.6 ~ 4.5 ounces)
225 ~ 275g (7.9 ~ 9.7 ounces)
MX-5050MKIV-2
A 145 ~ 175g (5.1 ~ 6.2 ounces)
B
315 ~ 385g (11.1 ~ 13.6
ounces)
9. If the readings are low in both directions, detach the brake spring from the
anchor hole on the brake lever and attach the spring to the next hole located
further away from the brake solenoid (refer to Figure 6-2).
10. If the readings are high in both directions, move the spring anchor point
closer to the brake solenoid.
11. After the spring anchor point is moved, re-check the brake torque.
12. Repeat the brake torque adjustment on the take-up reel.
NOTE: When measuring the brake torque of the take-up side, the torque of
the clockwise rotation is larger than the counterclockwise torque.
RETAINING RING B
SOLENOID PIN
TWO CROSS-RESESSED SCREWS
BRAKE ARM
RETAINING RING A
PLUNGER
STROKE
0.2±0.02 inch
(5±0.5mm)
BRAKE
SPRING
BRAKE ASSEMBLY
MOUNTING SCREW
CUSHION
BRAKE
DRUM
BRAKE
SOLENOID
BRAKE
BAND
TWO HEX SOCKET
HEAD SCREWS
BRAKE BAND GUIDE
BRAKE GUIDE
Figure 6-2
Brake Torque Adjustment
May 1992
6-3
6.3 Tape Lifter Adjustment
1. Thread the machine with tape.
2. Check the gap between tape and the lifters in Stop mode. If the gap is 1 ~ 2
mm, then the following adjustment is not necessary. If the gap is out of this
range, then perform the following adjustment.
3. Remove the reels on the transport panel. Referring to § 2.4, open the rear
panel.
4. Adjust the Lifter Stopper position by loosening the screws on the Lifter
Stopper so that the appropriate gap is obtained. Refer to Figure 6-3.
5. Close the rear panel.
6. Confirm that the tape does not touch the head when in Fast Wind mode.
7. If the tape touches the head, move the solenoid backward by loosening the
screws holding the Lifter Solenoid Bracket. Refer to Figure 6-3.
Figure 6-3
Tape Lifter Adjustment
6-4
May 1992
6.4 Capstan Motor Adjustment and Pitch Control Adjustment
1. Open the rear panel by removing the screws on the rear panel.
2. Turn on the machine, and load the tape on the machine. Make sure that the
Tape Speed mode is set to the FIX.
3. Set the Speed Select button to 15 ips (HI on the High Speed version). If the
machine is a Low Speed version, the speed adjustment is performed for 7.5
ips and 3.75 ips.
4. Connect the oscilloscope between CP3 and CP2 (GND) on the Control PCB
Assembly.
5. Press the PLAY button. Adjust the oscilloscope so that the oscilloscope
indicates one complete cycle of the square wave.
6. While reproducing the tape, adjust VR1 (Gain) so that duty cycle of the
square wave becomes 50%.
7. While observing the oscilloscope, pinch the capstan shaft with the thumb and
forefinger for several seconds. Be careful that the fingers are not caught
between the Pinch Roller and Capstan Shaft. When pinching the Capstan
Shaft, the waveform displayed on the oscilloscope becomes distorted. When
the capstan shaft is released, the waveform returns to normal. Adjust VR4
(Damp) to minimize the time it takes the waveform to recover after releasing
the capstan shaft.
8. Change the tape speed to 7.5 ips (HI on Low Speed version or LO on High
Speed version). Adjust the oscilloscope. Repeat step 6 with VR2 (Gain), and
step 7 with VR5 (Damp).
9. Change the tape speed to 3.75 ips (LO on Low Speed version). Adjust the
oscilloscope. Repeat step 6 with VR3, and step 7 with VR6.
10. Remove all measuring equipment. Close the rear panel.
11. Clean the Capstan Shaft and Pinch Roller.
50%
50%
JITTER
5V
0V
Figure 6-4
Waveform on Oscilloscope
May 1992
6-5
6.5 Pinch Roller Pressure Adjustment
The pinch roller pressure against the capstan shaft is determined by the
pinch roller solenoid spring. The pinch roller solenoid spring is adjusted with
a nut as shown in Figure 6-5.
The following adjustment should be performed after the machine has been
operated in Play mode at least 30 minutes to obtain a steady solenoid force
because the solenoid force decreases as temperature rises.
❏
MX-5050BIII
1. Remove both reels from the reel tables.
2. Tie a piece of string (15 cm) together to form a continuous loop. Place one
end of the loop around the capstan pinch roller shaft.
3. Press the EDIT button and then press the PLAY button. The pinch roller will
move to make contact with the capstan shaft and both will rotate.
4. Hook a spring scale (3kg) to the other end of the loop.
5. Pull on the scale straight from the center of the capstan shaft as shown in
Figure 6-5. Note the scale reading when the pinch roller loses contact with
the capstan (the pinch roller stops rotating). The scale reading should be 2.5
~ 2.7 kg (5.5 ~ 5.9 pounds).
6. If a proper scale reading was not obtained in step 5, loosen the locknut and
adjust the nut as shown in Figure 6-6. Turning the nut toward the spring
increases pinch roller pressure. Tighten the locknut.
7. After the adjustment has been completed, check that the plunger of the
solenoid reaches the bottom of the the solenoid coil (pinch roller can easily
be pushed away from the capstan shaft). If the plunger of the solenoid does
not reach the bottom, loosen the locknut and turn the pressure nut away
from the spring until the plunger just reaches the bottom. Check the pressure
adjustment again and tighten the locknut.
SPRING SCALE
PINCH ROLLER
LOOSEN
(COUNTERCLOCKWISE)
CAPSTAN SHAFT
Figure 6-5
Pinch Roller Pressure Measurement
TIGHTEN (CLOCKWISE)
Figure 6-6
Pinch Roller Solenoid
6-6
May 1992
MX-5050MKIV-2
1. Remove the pinch roller cap screw and the roller cap.
2. Thread a hex socket head screw (M3, length 25~30mm) into the pinch roller.
3. Press the EDIT button and then press the PLAY button. The pinch roller will
move to make contact with the capstan and both will rotate.
4. Measure the pinch roller pressure by using the Push function (piston part,
not hook part) of the spring scale.
Put the end of the piston part of the spring scale (3kg) on the hex socket
head screw (M3) from the direction of the capstan shaft. Refer to Figure 6-7.
Be careful that the piston part does not touch the capstan shaft.
5. Push on the scale and note the scale reading when the pinch roller just loses
contact with the capstan shaft (the pinch roller stops rotating).
The scale reading should be 2.7 ~ 2.8 kg (5.9 ~ 6.2 pounds).
6. If a proper scale reading is not obtained in step 5, adjust the nut shown in
Figure 6-6. Loosen the LOCK nut and Adjust the Adjustment Nut . Turning the
Nut in the spring direction increases the pinch roller pressure. Tighten the
Lock Nut after adjustment.
7. Confirm that the plunger reaches the bottom when the solenoid is activated.
If not, the solenoid pressure will not be strong enough so that even a slight
pressure will be able to move the pinch roller away from the capstan shaft.
8. If the plunger does not reach the bottom of the solenoid, loosen the Double
nut and readjust the pressure.
PINCH ROLLER
HEX HEAD
SOCKET SCREW
(M3,L=25~30mm)
PISTON
PUSH
PUSH
SPRING
SCALE
Figure 6-7
Pinch Roller Pressure Measurement
May 1992
6-7
6.6 Tape Speed Adjustment
Tape speed is adjusted by measuring the tape speed using a special test tape,
and then adjusting the speed to bring it into the desired range. Tape speed
should be adjusted at the normally used tape speed. Also, since tape tension
affects tape speed, to accurately measure tap speed, the test tape should first
be played normally from the supply side, and then the reels should be
reversed and the tape played near the end. In this way, the average tape
speed from one end of the tape to the other can be determined.
Note: A special tape is required for this procedure. If an accurate speed tape
is not available, please contact your Otari dealer for further information.
Follow the procedure below to measure and adjust the tape speed.
1. Clean the Head, Capstan Shaft and Pinch Roller before the measurement.
2. Press the Speed Mode Select button to set the FIX mode. Set the Record
mode button to SAFE position (protruded position).
3. Connect the frequency counter to the output connector. Press down the
Monitor button set TAPE position.
4. Set the machine to the most often used tape speed.
5. Wind the Test Tape of the selected speed around a blank of a NAB (10.5")
reel. Set this Test Tape on the supply side. Thread the tape on the machine.
Set the Reel Size Select switch to "L" size.
6. Press Play and read the frequency counter indication. This reading should be
2994Hz to 3006Hz (3000Hz ± 0.2 %) with a 3000Hz speed test tape. Reverse
the reels on the machine and check the speed again at the other end of the
tape to determine the average overall tape speed.
7. If the reading is out of range, adjust DIP SWs 1-4 and 1-5 on the CONTROL
PCB Assembly for the best speed reading. The switches affect tape speed as
shown in the table below.
Table 6-3
Tape Speed Settings
6-8
SW1-4
1-5
OFFSET
ON
OFF
ON
OFF
ON
ON
OFF
OFF
+0.1%
-0.1%
-0.2%
0%
May 1992
6.7 Reel Table Height Adjustment
The Reel Table may be detached from the machine by removing the three
cross-recessed screws accessible from the side of the transport.
1. Remove the side panel by removing the screws on the panel.
2. Loosen the height adjustment screws (hex socket head screws holding the
Reel Table shaft) and adjust the height of the table. While holding the table at
the appropriate height, tighten the adjustment screws.
3. Set the Reel onto the Reel Table. Make sure that the Reel Flange does not
touch the transport panel.
4. Mount the side panels to the machine.
Figure 6-8
Reel Table Height Adjustment
May 1992
6-9
6.8 Head Assembly Replacement
The Head Assembly is mounted on the tape guide posts and is attached to
the Guide Posts with screws marked "M" (refer to Figure 6-9). Each Head
Stack is attached to the Head Bracket with screws marked "W", and the Head
Brackets are attached to the Head Base with the screws marked "H" "A" and
"T". These screws are used to adjust the position of the head.
When one of the head stacks needs to be replaced, use the following
procedure.
1. Raise the Head Cover
2. Remove the screws marked "M" and remove the head base from the tape
guides.
3. Unsolder the lead wires coming from the Head PCB.
4. Remove the Head Stack from the Head Base by removing screws "A", "T" and
"H".
5. Attach the new Head Stack to the Head Base with the screw removed in Step
4.
6. Resolder the wires removed in Step 3.
7. Mount the Head Base to the Tape Guides with the screws "M".
After replacement of the heads, perform Head Position adjustment § 6.9) and
Azimuth Adjustment (§ 7.3.1 and § 7.4.3)
In addition to the above adjustments, the following adjustments are
necessary.
Repro Head
B. Reproduce EQ Adjustment
§ 7.3.3
Record Head
A. Record Bias Adjustment
B. Record Level Adjustment
C. Record EQ Adjustment
T1
M
W
W
§ 7.4.1
§ 7.4.3
§ 7.4.4
A3
T3
T2
A1 A2
W
W
W
M
W
H3
H1
M
H2
Figure 6-9
Head Assembly
6 - 10
May 1992
6.9 Head Position Adjustment
Whenever replacing a head, the following head position adjustments are
necessary. If the tape does not contact the heads properly, perform the
following adjustments.
NOTE: If the tape does not contact the heads properly due to improper
alignment, any one of the following problems may occur.
Reproduce Head Wrong Position
High Frequency Level Decreasing
Level Fluctuation
Record Head Wrong Position
High Frequency Level Decreasing
Level Fluctuation
Erase Head Wrong Position
Deterioration of the Erase Ability
❏
Height /Zenith Adjustment
Perform the following adjustment after raising the head cover.
1. Thread the machine with a tape that can be disposed of after use.
2. Adjust the head height and zenith visually by turning the screws marked "T"
and "H" in Figure 6-9 to move the tape to the middle of the head.
3. After the adjustment, mark the head surface with Head Marker Ink or a
Marker Pen.
4. Play the tape for about ten seconds.
5. Inspect the face of each head where the passage of the tape has worn away
the ink. If the wear pattern does not match that shown in Figure 6-10,
readjust the screws " T" and " H ".
6. After reapplying the ink, play the tape as in step 4, and again inpsect the face
of each head. Repeat this process until the wear pattern is correct.
WEAR PATTERN
MARKER INK
TRAPEZODIAL
WEAR PATTERN
CORRECT
WEAR PATTERN
(ZENITH NOT ADJUSTED
CORRECTLY)
(HEIGHT AND ZENITH
ADJUSTED CORRECTLY)
TAPE
TAPE
Figure 6-10
Height/Zenith Adjustment
May 1992
ZENITH
HEIGHT
6 - 11
❏
Wrap Adjustment
1. While reproducing 8kHz portion of the Low Speed Test Tape, apply pressure
with a cotton swab to the left side of the head. Observe the level change. If
the level increases by more than 0.5 dB, wrap adjustment is necessary. In the
same way, if the level increases by 0.5 dB when applying pressure from the
right side, wrap adjustment is necessary.
2. Turning the screw marked "W" in Figure 6-9, visually adjust the head so that
the tape approaches and leaves the head gap at approximately the same
angle. If the level increases by more than 0.5dB when pressing on the tape
on the right side of the head, rotate the head clockwise. If the level increases
by more than 0.5dB when pressing the tape on the left side of the head,
rotate the head counterclockwise.
3. Repeat step 1 and confirm that the level increases by less than 0.5 dB.
NOTE: Refer to the § 7.3.2 and § 7.4.4 for azimuth adjustment procedures.
Head
Gap
Tape
Cotton Swab
Figure 6-11
Wrap Adjustment
6 - 12
May 1992
7.1 Tools and Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.2 Preliminary Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.2.1 Peak Indicator Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.2.2 Test Oscillator Waveform and Level Adjustment . . . . . . . . . . . . . . . . . . . 7-4
7.3 Reproduce Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.3.1 Reproduce Head Azimuth Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.3.2 Reproduce Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
7.3.3 Reproduce Equalization Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
7.4 Record Electronics Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7.4.1 Record Bias Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
7.4.2 Record Head Azimuth Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
7.4.3 Record Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
7.4.4 Record EQ Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
7.4.5 Low Frequency Reproduce EQ Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
7.4.6 SEL-REP Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
May 1992
7-1
7.1 Tools and Equipment Required
•
Table 7-1
Reference Tapes
Alignment Tapes suitable for the tape speed most often used. Otari
recommends the following Alignment Tapes.
Tape Speed
Flux Level
MRL* Catalog No.
15 ips
250 nWb/m
320 nWb/m
250 nWb/m
320 NWb/m
200 nWb/m
21J205 (NAB)
21J303 (IEC)
21T204 (NAB)
21T302 (IEC)
21F101A (NAB, IEC)
7.5 ips
3.75ips
* Magnetic Reference Laboratories
•
An AC voltmeter calibrated in millivolts and decibels, having a high enough
input impedance so as not to load down the circuit under test, and able to
display dBm (0dBm = 0.775V)
•
A general purpose dual-trace oscilloscope such as those made by Tektronics,
Leader, Hitachi and Hewlett Packard.
•
A sweepable test oscillator capable of generating sine waves at frequencies
from 20 Hz to 20 kHz at +4 dBm (or whatever standard operating level is
used, e.g., –10 dBm or +6 dBm).
•
A reel of tape of the type normally used for sessions.
•
Hand Tools.
•
A non-magnetic alignment screwdriver with a blade small enough to fit the
trimmers on the PCB Assemblies.
•
A tape head demagnetizer (degausser).
•
Pure (90%) isopropyl alcohol, cotton swabs, and lint-free cloth for cleaning
the tape path.
CAUTION: Do not use rubbing alcohol, as this can leave water and oil
residues, and do not use any other solvent, as it may delaminate the heads.
7-2
May 1992
7.2 Preliminary Adjustments
These adjustments are performed when first receiving the machine, and then
again only when an audio component, such as the Heads, is replaced.
7.2.1 Peak Indicator Level Adjustment
NOTE: The PEAK indicator is factory preset to illuminate at a level equivalent
to 1040 nWb/m, which corresponds to approximately 3% THD.
1. Check the trigger level corresponding to the set Magnetic Reference Flux
Level.
Table 7-2
Trigger Level
Magnetic Ref. Flux Level
Trigger Level
185 nWb/m
250 nWb/m
320 nWb/m
Standard Level + 15.0 dB
2. Connect an oscillator to the CH1 INPUT connector, adjust the oscillator so
that it generates a sine wave (1kHz) at the trigger level. Confirm that neither
of the internal Test Oscillator buttons are pressed.
EXAMPLE: Set the oscillator to +16.4 dBu when the Magnetic Reference
Level is 250 nWb/m and the Reference Level is +4 dBu.
3. Set the Monitor button to SOURCE position (not depressed).
4. Adjust VR701 for CH1 and VR801 for CH2 on the VU Meter Amp PCB which
is located behind the VU meter so that the peak indicator illuminates at the
trigger level.
May 1992
7-3
7.2.2 Test Oscillator Waveform and Level Adjustment
Perform this adjustment after the Level Matching Adjustment (§ 7.2.1) has
been completed.
1. Set the Monitor button of CH1 to SOURCE position.
2. Press the 1kHz TEST OSC button on the AMP Panel.
3. Adjust VR502 on the REC/REP AMP PCB Assembly (see Figure 7-1) so that
the VU meter indicates 0 VU. Perform the same adjustment to the CH2
REC/REP AMP PCB Assembly.
4. Press the 10kHz OSC FREQ button.
LINE OUT
AMP
R
R
L
R
REC
L
R
L
SW301
SW302
SW401
H
SW402
L
SEL•REP
VR206
VR205
REP.AMP
R
REC EQ
R
REC.EQ
L
BIAS OSC
SW201
LINE OUT
AMP
L
VR105
REP.AMP
VR103
VR102
VR104
VR203
SW504
L
H
BIAS
VR306
VR106
R
L
VR303
MIC AMP
R
L
L
VR304
VR108
R
SW506
SW507
SW102
SW202
VR208
1K
VR403
10K
L
REC. EQ
VR404
R
REC. LEVEL
VR305
TEST OSC
VR405
MONITOR
VR406
5. Adjust VR501 so that the VU meter indicates 0VU.
LINE AMP
R
SW101
L
REP.EQ
L
SEL•REP AMP
L
SEL•REP
AMP
R
REP. EQ
R
VR202
L
H IEC NAB
EQ
OUTPUT
LEVEL
TEST OSC
VR502
VR101
SW503
VR204
VR501
VR201
SW502
L
LINE
AMP
R
LINE AMP
L
MIC AMP
R
MIC AMP
L
SW501
M H
MIC ATT
REC. LEVEL
Figure 7-1
REC/REP AMP PCB (DIP Side)
Switches and Trimmers on the REC/REP AMP PCB
SW301
SW401
SW302
SW 402
SW 506
SW507
SW102
SW202
SW501
SW502
SW503
SW504
VR306
VR406
7-4
Record Selection L Ch
Record Selection R Ch
SEL/REP Selection LCh
SEL/REP Selection R Ch
TEST OSC 1kHz
TEST OSC 10kHz
Monitor Selection LCh
Monitor Selection R Ch
Mic. Attenuator
Record Level Selection
EQ(NAB/IEC) Selection
Output Level Selection
Bias L CH
Bias R CH
VR303
VR304
VR403
VR404
VR305
VR405
VR106
VR206
VR108
VR208
VR501
VR502
VR101
REC EQ High Speed L CH
REC EQ Low Speed L CH
REC EQ High Speed R CH
REC EQ Low Speed R CH
REC Level L CH
REC Level R CH
REP SRL Level LCH
REP SRL Level R CH
Input Level L CH
Input Level R CH
OSC Level (10kHz)
OSC Level (1kHz)
SEL-REP Level L CH
VR201
VR205
SW201
VR105
SW101
VR102
VR103
VR104
VR202
VR203
VR204
SEL-REP Level R CH
Low F Comp. R CH
Low Comp. Selection R Ch
Low F Comp. L CH
Low Comp. Selection L Ch
15ips REP EQ L CH
7.5ips REP EQ L CH
3.75ips REP EQ LCH
15ips REP EQ RCH
7.5ips REP EQ RCH
3.75ips REP EQ RCH
May 1992
7.3 Reproduce Adjustments
7.3.1 Reproduce Head Azimuth Adjustment
1. Turn off the power to the machine.
2. Clean and demagnetize the Heads, Lifters, and Tape Guides. Turn on the
power to the machine.
3. Thread the machine with a 7.5 ips Reproduce Alignment Tape.
4. Set the tape speed to 7.5 ips. Set the RECORD READY button to SAFE
position. Press down the Monitor button to TAPE position.
NOTE: Insert the Headphone Plug into the Phone Jack. Adjust the Monitor
Level with the Output Level Control Knob.
5. Connect one input channel of the oscilloscope to the CH 1 OUTPUT
connector. Connect the other input channel of the oscilloscope to the CH 2
OUTPUT connector. Adjust the oscilloscope to display the input waveforms
as a "lissajous" pattern using the X-Y display function (see Figure 7-3).
6. While reproducing the azimuth adjusting section (500 Hz) of the 7.5 ips test
tape, adjust the azimuth adjustment screw A3 (see Figure 7-2) so that the
lissajous figure becomes a straight line.
7. While reproducing the 16 kHz section of the Test Tape, adjust the azimuth
adjustment screw A3 so that the lissajous figure becomes a straight line.
NOTE: Less and less adjustment is required as the frequency increases to
cause the oscilloscope pattern to become correctly displayed. At higher
frequencies, it will be impossible to achieve a perfectly straight line, some
amount of jitter is normal. Adjust the azimuth screw until the best possible
result is obtained.
T1
M
W
W
A2
A1
A3
T3
T2
W
W
W
M
W
H3
H1
M
H2
Figure 7-2
Head Adjustment Screws
May 1992
7-5
Improper Adjustment
(180˚ Out of Phase)
Improper Adjustment
(90˚ Out of Phase)
Proper Adjustment
(In Phase)
Figure 7-3
Wave shape On the Oscilloscope
7.3.2 Reproduce Level Adjustment
Perform the following adjustment at the speed most often used.
1. Thread the machine with the Reproduce Alignment Tape (Refer to § 7.1).
Press down the both Monitor buttons to TAPE position.
2. Connect the AC Voltmeter to the CH 1 OUTPUT connector.
3. Set the SRL switch to SRL position. Play the 1 kHz at Reference Level portion
of the Reproduce Alignment Tape.
4. Adjust VR106 (SRL LEVEL) on the REC/REP AMP PCB Assembly so that the
AC voltmeter indicates +4 dBu.
5. Connect the AC voltmeter to 2 channel OUTPUT connector and repeat Steps
3 and 4 for 2 channel using VR206.
7-6
May 1992
7.3.3 Reproduce Equalization Adjustment
NOTE: In this section, the Reproduce EQ is adjusted. Low Frequency
Compensation will be covered in § 7.4.6.
1. Set the SPEED LO/HI switch to the HI position.
2. Thread the 15 ips Reproduce Alignment tape. (For Low Version models,
thread 7.5 ips Alignment tape instead.)
3. Set the both RECORD READY buttons of the all channels to the SAFE
position. Press down the both Monitor buttons to TAPE position.
4. Connect the AC voltmeter to the CH1 Output connector.
5. Play the 10 kHz portion of the Reproduce Alignment tape and adjust VR 102
for High Speed models (VR103 for Low Speed models) on the REC/REP AMP
PCB until the AC voltmeter indicates +4 dBu.
6. Connect the AC voltmeter to 2 channel OUTPUT connector and repeat Step 5
for 2channel by adjusting VR202 (VR203 for Low Speed models).
7. Set the SPEED LO/HI switch to the LO position.
8. Thread the machine with the 7.5 ips Reproduce Alignment tape. (3.75 ips
tape for Low Speed models) .
9. Connect the AC voltmeter to the CH 1 OUTPUT connector.
10. Play the 10 kHz portion of the Alignment tape and adjust VR103 for High
Speed models (VR104 for Low Speed models) until the AC voltmeter
indicates -6 dBu.
NOTE: 7.5 ips alignment tape equalization tones are recorded at 10 dB
below the reference level.
11. Connect the AC voltmeter to the channel 2 OUTPUT connector and repeat
Step 10 by adjusting VR203 for High Speed models. (For Low Speed models,
VR204).
May 1992
7-7
7.4 Record Electronics Adjustments
7.4.1 Record Bias Level Adjustment
1. Thread the machine with the tape normally used for sessions.
2. Press down the RECORD READY button to the READY position and set the
Monitor button to SOURCE position. Set the SPEED HI/LO switch to the Hi
position.
3. Set the OSC FREQ button on the Amplifier Panel to 10 kHz position.
4. Adjust the Input Level Control knob so that the VU meter indicates –10VU
(–20VU for 7.5 ips).
5. Press the PLAY and RECORD buttons simultaneously to place the machine in
Record mode, and press down the Monitor button to TAPE position.
6. Turn VR306 fully counterclockwise. While observing the CH 1VU meter, turn
VR306 clockwise until a peak in the indication on the VU meter is observed.
7. Continue turning VR306 clockwise until a decrease equal to the selected
Overbias amount is observed. Refer to Table 7-2 for Overbias amounts for
various tape types.
8. Repeat Steps 5 through 7 for 2 channel using VR406.
Table 7-3
Overbias Values (dB)
Peak Bias Value
MKIV-2, MKIV-2E, BIII2, BIII-2E
Recommended Bias Value
Bp
Br
Output
δdB
Tape Speed (ips)
Frequency (Hz)
3.75
10 k
7.5
10 k
15
10 k
AGFA PEM 468
AGFA PEM 469
AMPEX 406/407
AMPEX 456
BASF LGR50P
BASF SM911
SCOTCH 206/207
SCOTCH 226/227
8.0
8.0
7.0
8.0
7.5
8.0
7.0
8.0
5.0
5.5
4.5
5.5
5.5
5.0
4.5
5.0
3.0
3.5
2.7
3.0
3.5
3.0
2.7
3.0
Tape Speed (ips)
Frequency (Hz)
7.5
10 k
15
10 k
AGFA 469
AMPEX 456
SCOTCH 2265.0
3.5
3.5
3.5
2
2
2
Unit: dB
BIII-F
10 kHz
Bias Value
Unit: dB
7-8
May 1992
7.4.2 Record Head Azimuth Adjustment
1. Thread the machine with a reel of blank tape.
2. Set both Record Ready buttons to the READY position and set both Monitor
buttons to TAPE position.
3. Connect an external oscillator to the CH 1 and CH 2 INPUT connectors.
Connect one probe of the oscilloscope to CH 1 and the other probe to the CH
2 OUTPUT connectors. Set the oscilloscope to display the input signals as a
lissajous pattern.
4. Set the external oscillator to produce 1 kHz sine waves at +4 dBu or at the
studio level.
5. Press the RECORD and PLAY buttons to enter Record mode.
6. Adjust the Record Head Azimuth adjustment screw A2 until the display on the
oscilloscope becomes a straight line at 45 degrees as shown in Figure 7-5.
7. Set the external oscillator to 10 kHz, and adjust the Record Head Azimuth
adjustment screw until the display on the oscilloscope becomes a straight
line at 45 degrees as shown in Figure 7-5.
8. Set the external oscillator to 16 kHz, and adjust the Record Head Azimuth
adjustment screw until the display on the oscilloscope becomes a straight
line at 45 degrees as shown in Figure 7-5.
NOTE: Less and less adjustment is required as the frequency increases to
cause the oscilloscope pattern to become correctly displayed. At higher
frequencies, it will be impossible to achieve a perfectly straight line, some
amount of jitter is normal. Adjust the azimuth screw until the best possible
result is obtained.
T1
M
W
W
A2
A1
A3
T3
T2
W
W
W
M
W
H3
H1
M
H2
Figure 7-4
Head Assembly
Figure 7-5
Waveshape on the Oscilloscope
May 1992
Improper Adjustment
(180˚ Out of Phase)
Improper Adjustment
(90˚ Out of Phase)
Proper Adjustment
(In Phase)
7-9
7.4.3 Record Level Adjustment
1. Thread the machine with tape and set the SPEED Select Switches for the Tape
Speed most often used.
2. Set both RECORD READY butons to the READY position.
3. Set both Monitor button to TAPE position.
4. Press the 1kHz Test Oscillator button on the AMP Panel. Adjust the Input
Control knob so that the VU meters indicate 0VU. (Input a signal level of
–10VU for 7.5 ips.)
5. Press the PLAY and RECORD buttons to begin recording.
6. Adjust VR305 on the REC/REP PCB Assembly so that the CH 1 VU meter
indicates 0 VU (–10 VU if adjusting at 7.5 ips).
7. Check to see that there is no difference in the indication on the VU meters
when switching between SOURCE and TAPE modes.
8. Repeat Steps 4 and 7 for Channel 2 by adjusting VR405.
7.4.4 Record Equalization Adjustment
NOTE: These adjustments should be performed after the Playback
Equalization and Record Bias adjustments are completed.
1. Thread the machine with tape and set the SPEED select switch to the HI
position, (15 ips for High Speed, 7.5 ips for Low Speed).
2. Press the 10kHz Oscillator Frequency button to activate the Test Oscillator.
3. For High Speed models(HI; 15ips), adjust the Input Level knob until the VU
meter indicates 0VU. For Low Speed models(HI; 7.5 ips), adjust the Input
Level knob until the VU meter indicates –10VU.
4. Set the Monitor button to TAPE position. Set both RECORD READY buttons
to the Ready position, and press the PLAY and RECORD buttons to begin
recording.
5. Adjust VR303 (REC EQ H) on the REC REP PCB Assembly until the VU meter
indicates 0 VU (–10 VU for Low Speed).
6. Repeat Step 5 for Channel 2 using VR403.
7. After setting the SPEED select switch to the Lo position, repeat Steps 3
through 6 using the REC EQ L trimmer (VR304 for CH1, VR404 for CH2). For
High Speed models, adjust the trimmers until the VU meter indicates –10VU
at step3 and 5. For Low Speed models, adjust the trimmers until VU meter
indicates -20 VU at steps 3 and steps 5.
7 - 10
May 1992
7.4.5 Low Frequency Reproduce Equalization Adjustment
1. Thread a blank tape on the machine.
2. Connect the external oscillator to the CH1 and CH2 input connectors.
3. Set the Monitor button to SOURCE positon. Confirm that the VU meters
indicate 0 VU.
4. Press down the Monitor button to TAPE position. Set the machine to the
speed which is most often used. Confirm that SW201 and 101 on the
REC/REP AMP PCB has been set to the ON position.
5. While Record the signal from the oscillator, adjust VR105 on the REC/REP
AMP PCB Assembly so that the VU meter indicates 0 VU. Make the same
adjustment for channel 2 using VR205.
7.4.6 Sel·Rep Level Adjustment
1. Thread the machine with the tape of the type normally used for sessions.
2. Press the 1kHz Oscillator button to activate the Test Oscillator.
3. Adjust the Input Level Knob so that the VU meters indicate 0VU.
4. After recording approximately 30 seconds of 1 kHz tone on the tape, rewind
the tape to the starting point.
5. Set the Monitor button to TAPE position. Press down the both SEL-REP
buttons to place the machine into Sel-Rep Mode.
6. Adjust VR101 (SEL-REP LEVEL) on the REC/REP AMP PCB Assembly so that
the CH 1 VU meter indicates 0 VU.
7. Repeat Step 6 for 2 channel using VR201.
May 1992
7 - 11
8.1 Tape Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2 Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
May 1992
8-1
8.1 Tape Transport
Track Configuration
Tape Width
Tape Width: 1/4"
MX-5050 BIII-F
MX-5050 BIII-2
MX-5050 BIII-2E
MX-5050 MKIV-2
Full Track
2 Track NAB
2 Track DIN
2 Track NAB
Heads
BIII-F
Repro (2T) x 1
Erase x 1
Record x 1
Repro (FT) x 1
BIII-2
Erase x 1
Record x 1
Repro x 1
BIII-2E
Erase x 1
Record x 1
Repro x 1
Motor
Capstan x 1 (DC brushless PLL servo motor)
Reel x 2 (AC Induction Motor)
Reel Size
max. 10.5" NAB
Tape Speed
High Speed Version: 15 ips/7.5 ips
Low Speed Version: 7.5 ips/3.75 ips
Tape Speed Accuracy
max. ± 0.2 %
Tape Speed Deviation
max. 0.2%
Wow And Flutter
Peak Weighted Per DIN 45507
MKIV-2
Erase x 1
Record x 1
Repro x 1
15 ips:
max. ± 0.06 b%
7.5 ips: max. ± 0.08 %
3.75 Ips: max. ± 0.12 %
Start Time
Stop Time
Time required to accelerate to double the specified Wow and Flutter value.
Speed
Start Time
15 ips
7.5 ips
3.75 ips
max. 0.5 sec
max. 0.4 sec
max. 0.3 sec
Time to stop from Play mode
Speed
Stop Time
15 ips
7.5 ips
3.75 ips
max. 0.5 sec
max. 0.3 sec
max. 0.3 sec
Time to Stop from Fast Wind max. 3 sec.
Fast Wind Time
8-2
max. 110 sec for 2500 ft (50Hz)
max. 90 sec for 2500 ft (60 Hz)
May 1992
8.2 Electronics
Input
Output
Line
Mode: Transformerless Active Balanced
Input Impedance: 100kΩ, 20Hz–20kHz
Nominal Level: +4dBu
Max. Level: +30dBu
Connectors: XLR Female type
Mic
Input Impedance: 10kΩ
Min. Level: –70dBu/–50dBu/OFF switchable
Mic. Impedance: Min. 150Ω
Line
Output Impedance: Max 5Ω (20Hz–20kHz)
Load Impedance: MIn. 200Ω
Nominal Level: +4dBu/–16dBu switchable
Max Level: +26dBu for 200Ω
Connectors: XLR Male type
Phone
Load Impedance: 8Ω
1/4" Standard Stereo Phone Jack
Note: 0dBu = 0.775V
Equalization
NAB/IEC Selectable
Standard Reference Flux
MX-5050 BIII-2, MKIV-2, BIII-F
MX-5050 BIII-2E, MKIV-2E
Frequency Response
REC/REP
Frequency Response
15 ips
7.5 ips
3.75 ips
30Hz - 20kHz ±2dB
30Hz - 18kHz ±2dB
20Hz - 10kHz ±2dB
REC/SEL-REP
Frequency Response
15 ips
7.5 ips
3.75 ips
250Hz - 7.5kHz ±3dB
250Hz - 5kHz ±3dB
250Hz - 2.5kHz ±3dB
Model
BIII-2, MKIV-2, 2E
Track (2mm)
Track (2.75mm)
Unwtd Wtd
Unwtd Wtd
Signal to Noise Ratio
Filter
Speed EQ
15ips
IEC
NAB
7.5ips IEC
NAB
3.75ips IEC
NAB
70
69
67
71
64
64
73
72
70
73
67
67
185/250/320* nWb/m
250/320/510* nWb/m
(*open circuit flux)
71
70
68
72
65
65
74
73
71
74
68
68
BIII-F
Unwtd Wtd
74
73
71
75
68
68
77
76
74
75
71
71
Measured with respect to a recording level of 1,040 nWb/mat 15 and 7.5 ips,
and 740 nWb/m at 3.75 ips, using AMPEX 456 or equivalent tape.
Unwtd: Using a 30Hz to 18kHz RC filter to eliminate noise outside the audio
spectrum.
Wtd: Using a NAB or ANSI "A" weighting filter and a 1kHz reference.
May 1992
8-3
Distortion
Total Harmonic Distortion
max. 0.3% (15 ips 1kHz, 250 nWb/m, AMPEX 456)
Crosstalk
MX-5050 BIII-2, MKIV-2
MX-5050 MKIV-2E, BIII-2E
min. 55dB
min. 48dB
Depth of Erasure
MX-5050 BIII-F
MX-5050 BIII-2, MKIV-2
MX-5050 BIII-2E, MKIV-2E
min. 75dB
min. 75dB
min. 70dB
Test Oscillator
Sine wave
Bias Frequency
133kHz
Erase Frequency
133kHz
Operating Environment
5 ~ 40˚C (41 ~ 104˚F) 20 ~ 80% RH
Storage Environment
–20 ~ 45˚C (–4 ~ 113˚F) 10 ~ 80% RH
Dimensions
MX-5050 BIII
MX-5050 MKIV-2
525 x 430 x 275 mm (H x W x D)
480 x 430 x 680 mm
Weight
MX-5050 BIII
MX-5050 MKIV-2
28kg
34kg
Optional Accessories
Name
Part No.
Auto Locator (8-memory)
Auto Locator (99-memory)
Remote Controller (Transport)
Synchronizer
Remote Controller for EC-102
Resolver
Input Transformer (2Ch unit)
Output Transformer (2Ch unit)
Pedestal
Rack Mount Kit
Full Track Kit
CB-119
CB-120
CB-127
EC-102
CB-131
EC-401
ZA-53T-T
ZA-53S-T
ZA-52L
RK-2B
KH-44KB
8-4
1kHz/10kHz
Model
BIII-F, 2, 2E, MKIV-2, 2E
BIII-F, 2, 2E, MKIV-2, 2E
BIII-F, 2, 2E, BQIII
May 1992
DIMENSIONS
430
BIII
206
527
EDIT
PEAK
VU
PEAK
VU
220
MKIV-2
430
EDIT
680
480
168
May 1992
8-5
Section 9 Exploded Views and Parts List
The following exploded view drawings and parts lists are provided for service
reference. Each drawing has its own parts list followed with the same key
number and title.
When ordering parts, give a full description, using both the part number and
the name of the part. If there seems to be a discrepancy between the
drawings herein and your MX-5050, contact OTARI. We assume no liability
for improper servicing due to changes and improvements which we make
that subsequently render certain of these documents obsolete.
BIII
No.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Assembly Name
Case Assembly
Chassis Assembly
Head Assembly
Reel Assembly
Pinch Roller Assembly
Capstan Assembly
Shifter Assembly
Tension Arm Assembly
Impedance Roller Ass'y
Timer Assembly
Control Assembly
Amplifier Assembly
Connector Panel Ass'y
Parts No.
Page
K1168
T0067
KH-44K
KW-41J
KP-4X
KC-41H
KR-4W
KA-4X/KA-4Y
KI-4T
ZA-95G
CB-23U
A1220
CB-792
9-2
9-4
9-6
9-8
9-10
Parts No.
Page
K1170
T0069
KH-44K
KW-41J
KP-4X
KC-41H
KR-4W
KA-4X/KA-4Y
KI-4T
ZA-95G
CB-23U
A1221
A1221
CB-794
9-20
9-22
9-24
9-26
9-28
9-12
9-14
9-16
9-18
MKIV-2
No.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
December 1997
Assembly Name
Case Assembly
Chassis Assembly
Head Assembly
Reel Assembly
Capstan Assembly
Shifter Assembly
Tension Arm Assembly
Impedance Roller Assembly
Timer Assembly
Control Assembly
Amplifier Assembly
Amp. Connector Assembly
Connector Panel Assembly
9-30
9-32
9-34
9-36
9-38
9-1
Section 9 and Exploded Views and Parts List
BIII
MX-5050 Operation and Maintenace Manual
Case Assembly: K1168
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
9-2
Description
Rear Cover Assembly
Grille, Ventilation
Plate C
Foot
Panel, Side
Hundle
Washer, Trim
Panel, Rear
Plate, L
Plate, R
Grille, Ventilation
Plate
Panel, Bottom
Foot, Case
Parts No.
K1168-A
CY5001A
K102911
CY4013
K116802
CY1004
KZ6C028
CB792
A106204
K102909
K102910
CY5001A
K102907
K102906A
CY4011-A
Notes
May 1992
C4x25B
PS4x8
4
B4x8B
9
13
B4x8B
15
TS3x8
12
14
B4x8B
15
10
B4x8B
7
C4x25B
6
11
5
8
3
2
PS3x6
TS3x8
1
7
B4x8B
B4x6B
5
6
4
PS4x8
May 1992
9-3
Chassis Assembly: T0067
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
9-4
Description
Panel, Deck Cover
Blind
Control Assembly
Panel, Top
Transformer, Power
Frame
Angle
Bracket L
Bracket R
Bracket
Cover, Fuse
FUSE PCB Assembly
Bracket L
Bracket R
CONTROL PCB Assembly
Angle, Frame
Washer, Trim
Washer
Stud
Stud
Parts No.
T006702
T006703
CB-23U
T006701
TF11030
T006708
T506405
T007104
T007105
T006705
T005306
PB-7VCA
T006710
T006709
PB-4RNA
T506104
KZ6C051
KZ6C011
KZ9L080A
KZ9A095B
Notes
May 1992
1
O3x8B
17
18
3
2
O3x8B
17
18
F4x15
F4x15
F4x12
F4x12
4
6
19
7
5
PS4x8
8
C3x12
PS3x6
TS3x6
4W
4SW
4N
10
11
PS3x6
PS3x6
4W
4SW
4N
6
19
9
PS3x6
TS3x6
12
15
13
F4x10
PS3x6
14
20
16
PS3x6
B4x8
C3x12
TS3x6
F4x10
PS3x6
20
TS3x6
May 1992
30%, K.Sug
MX-5050
9-5
Head Assembly: KH-44K
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
9-6
Description
Head Housing Assembly
Stud
Base, Head
Spring, Head Adjustment
Bracket, Head
Post, Guide
Erase Head Assembly,
1/4" 2CH
Record Head Assembly,
1/4" 2CH
Reproduce Head Assembly,
1/4" 2CH
Cover, Housing
Head Housing,Front
Guide, Tape
Connector
Bracket, Connector
Plate, Shield
Pole, Guide
Clamp, Cable
Bracket L, PCB
Bracket R, PCB
Cover, Protection
HEAD, RELAY PCB Assembly
Washer, Polyslider
Parts No.
KH-4Y-A
KH4Y009
KH0C047
GS2016
KH0D178
KG4E001
Notes
Head Sub Assembly
KH-44KA
GH4E082B
GH4R005B
GH4P027B
KH0F038
KH0F037
KG4A003
CN314002
KH4Y004
KH4Y001A
KG6E020
PZ1G053
KH41I01
KH41I02
KH41T02
PB-78IAB
F523030
Head Sub Assembly
KH-44KA
May 1992
C3x8B
B3x8B
1
TS3x6
2
20
C3x6B
2
C3x12N
C3x12B
B3x8B
18
C3x12B
21
C3x12N
B3x8B
B3x8B
22
3
F3x6N
19
5
6
O3x30N
7
O3x10B
16
4
8
9
O3x10B
O3x10B
12
12
O3x10B
PS3x8
10
11
13
14
PS3x8
14
15
C3x12
C3x12
17
PZ3x6
C3x12
50%, K.Sug
May 1992
9-7
Reel Assembly : KW-41J
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
9-8
Description
Reel Shaft Assembly
Reel Table Assembly
Holder, Reel Table
Protector, Reel
Bracket, Reel Motor
Motor, Reel
Base L , Brake
Bracket, Connector
Base R, Brake
Brake Band Assembly
Spring
Stopper, Cable
Pin, Solenoid
Solenoid
Damper
Guide, Brake
Drum, Brake
Ring, E type
Ring, E type
REEL MOTOR DRIVE PCB Assembly
Bracket A, Reel Motor Draive PCB
Bracket B, Reel Motor Draive PCB
Parts No.
KW-41DG
KW-41EA
KW0B056
KW0H007A
KW0G016
MR1C005
KW0G013
KW41J01
KW0G012
KW-4J-A
GS1175
KZ3A047
KZ5A003
GP1F03
PZ1B049
KW4B001
KW0A012
F74TE15
F74TE09
PB-4RNA
T005317
T005318
Notes
May 1992
Reel Assembly: KW-41J
1
P3x8N
F4x8N
1
2
P3x8N
F3x6
3
F4x8N
4
C4x10
F3x6
2
F4x15
3
PS4x8
4
C4x10
5
4SW
F4x15
4N
6
20
7
21
TS3x6
PS4x8
8
PS4x10
5
PS3x6
4SW
4N
PS3x6
10
11
22
6
TS3x5
9
19
13
16
15
12
18
19
PS3x6
PS4x10
TS3x5
14
C3x6
19
3SW
10
3W
PS3x6
13
3W
3SW
15
C3x6
C4x10
18
17
11
14
19
16
12
PS3x6
C4x10
17
30%
MX-5050
ALL MODELS
REEL A'y
KW-21G
KW-41J
EX 00003
May 1992
9-9
Pinch Roller Assembly: KP-4X
Capstan Assembly: KC-41H
Shifter Assembly: KR-4W
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
9 - 10
Description
Cap, Pinch Roller
Shaft, Pinch Roller
Shaft, Arm
Pinch Roller Arm Assembly
Solenoid
Screw, Adjustment
Damper
Washer Spherical
Spring
Nut, Dubble
Pin, Solenoid
Stopper, Solenoid
Stud
Bracket, Motor
Cap, Dust
Ring
Motor, Capstan
Shaft, Link Arm
Shifter Link Assembly
Collar
Shaft, Arm
Arm A, Lifter
Arm B, Lifter
Bracket,Shifter Solenoid
Solenoid
Arm, Link
Angle
Pipe, Rubber
Hook
Spring
Spring
Spring
Washer, Polyslider
Stud
Ring, E type
Ring, E type
Ring, E type
Parts No.
KP0C034
KP-4S-B
KP0B060
KP4L001
KP-4X-A
GP1B12
KZ6A113
PZ1C021
KP0G004
GS2163
F517-4
KZ5A003
KZ2A016
KZ9I250A
KC4H001
KC0B029
PZ1C130
MR-1L
KR4W005
KR-4W-A
KZ7C109
KR4B001
KR0B005
KR0B006
KR4W007
GP1A09
KR4W004
KZ3A042
PZ1C174
KZ3A167
GS1185
GS1028-A
GS1149
F524060
KZ7A823
F74TE09
F74TE20
F74TE15
Notes
May 1992
O3x10B
1
34
2
3
F3x10
F3x10
F4x12
F4x12
PS3x6
28
29
36
25
32
12
30
PS3x6
19
36
21
20
PZ3x6
36
PS4x6
12
6
26
36
7
36
37
27
13
14
8
35
PS3x6 14
3W
3W
PS4x8
PS3x6
22
4
14
14
23
16
15
5
17
31
38
18
9
10
11
PS4x10
24
33
C4x8
30
37
PS4x6
91'9.10
変更岩崎
May 1992
50
K.Sugimo
MX-5050 BQ
BIII-2, MKI
PINCH ROLL
CAPSTAN,
SHIFTER A'y
(KP-4X)(KC-4
(KR-4W)
EX 0002
9 - 11
Tension Arm Assembly: KA-4X/KA-4Y
Impedance Roller Assembly: KI-4T
Timer Assembly: ZA-95G
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
9 - 12
Description
Cap, Arm
Arm, Tension
Shaft, Arm
Washer, Polyslider
Holder, Arm
Guide, Tape
Hook, Spring
Nut
Hook A, Spring
Stopper, Arm
Hook B, Spring
Switch Actuator Assembly
Magnet Assembly
Roller Assembly
Collar
Bearing
Ring
Holder
Spring
Washer
Ring, Shaft
Washer
Nut, Holder
Boss
Disk, Tacho
Stud
ROLLER TACHO PCB Assembly
Timer Display Assembly
Spring
Spring
Switch, Micro
Hook, Spring
Hook
Bracket
Parts No.
KA0C005
KA0A017A
KA4J001
F524-5
KA0B008
KG4D007
KZ3A024
KZ6D004
KA0E017
KA4X001
KA0E005
KA-4K-B
KA-4K-C
KI-4J-B
KZ7C057
BA1Z022
F7017
KI0B014
GS2077
KZ6C057
F7206
KI0H024
KI0H025
KI4T001
SR3Z033
KZ9H480C
PB-4HCA
ZA-95G
GS1025
GS1048
WH51027
KZ3A023
KZ3A167
KZ2A165
Notes
Impedance Roller
Sub Assembly
KI-4J-A
May 1992
1
F2x4
6
2
F3x6
14
3
4
SE
28
1
T
5
R
ZE
O
PE
TA
1
H EAR
S
M
EE
SP
CH
D
2
S
6
3
F2x4
H
S-
IP
T
E-
EA
M
L
EP
TI
R
%
R
CL
2
F3x6
F3x12
3
4
5
34
28
15
16
17
7
20
33
18
TP2.6x6
8
4
19
C3x10
20
29
PS4x6
8
4
C3x10
16
13
21
9
12
22
PZ3x6
23
10
30
24
3W
PS3x6
26
S3x4
11
3SW
B3x4
31
25
27
32
3W
PZ3x6
P2x5
PS3x15
3W
PS3x15
91'9.10
変更岩崎
May 1992
61%
K.Sugimoto
MX-5050 BQIII,
BIII-2, MKIV-2
TENSION ARM,
IMPEDANCE
ROLLER,
TIMER A'y
(KA-4X,KA-4Y)
(KI-4T)(ZA-95G)
EX 00030''
9 - 13
Control Assembly: CB-23U
No.
1
2
3
4
5
A
B
C
D
E
F
G
H
H
6
7
8
9
10
11
12
13
14
15
9 - 14
Description
Panel, Control
Sheet, Control Panel
Switch, Power
Capacitor, Spark Killer
TRANSPORT CONTROL SWITCH
PCB Assembly
Button, CUE
Button, EDIT
Button,RECORD
Button, PLAY
Button, STOP
Button, F.FWD , RWD
Switch, Selector
Knob
Cap, Knob
Escutcheon, Switch
Escutcheon, Switch
Angle
Stud
Stud
Stud
Connector Housing, Plug
Connector Contact, Plug
Connector Housing, Receptacle
Connector Contact, Receptacle
Parts No.
CB23U01
CB23U02
WH42062
CZ20001W
PB-7UZA
KN2145
KN2147
KN2144
KN2142
KN2141
KN2143
KN2184
KN1108
KN1099
PZ4A026
PZ4A027
T006704
KZ7B160
KZ7B158
KZ7B159
CN402029
CN7B-041
CN402030
CN7B-042
Notes
Assembly
May 1992
May 1992
15
14
13
12
ON
R
WE
PO
TS3x6
4
F
OF
G
9
T
FIX
H
10
G
9
ON
TR
OL
UP
HC
PIT
C
WN
DO
PS3x6
VA
RI
E
OD
SP
EE
DM
EX
3
H
L
D
EE
SP
L
R
SIZ
T.U E
P
S
11
L
SU EEL
P
S
E
6
9
IT
ED
PS3x6
CU
A
B
C
D
E
F
7
PS3x6
5
11
1
F3x6B
2
PS3x6
8
Y
9 - 15
Amplifier Assembly: A1220
9 - 16
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Description
Cap, Knob
Knob
Collar
Knob
Spacer
Potentiometer
Amp Trim Panel Assembly
Panel, Amp. Top
VU Meter
Jack, Phone
Switch
Button
Button
Button
Blind
Blind
Frame L, Amp
Frame R, Amp
Bracket, PCB
Collar
Shield, Illumination
REC/REP AMP PCB Assembly
23
24
25
26
27
28
29
30
31
LED PCB Assembly
LED PCB Assembly
LED PCB Assembly
LED PCB Assembly
REC EQ PCB Assembly
VU Meter Amp. PCB Assembly
Washer, Trim
Washer
Spacer
Parts No.
Notes
KN1102
KN1100A
KZ7C111
KZ1063B
KZ6C017
RV224005
A1220-A
A1220-B
ME11005
CN602144
WH340013
KN2095
KN2094
KN2093
PZ1B012
PZ1B010
A102808
A102807
A106206
A102809
PZ1B013
PB-1GYA (BIII-2)
PB-16EJ (BIII-F)
PB-1GYC (BII-2E)
PB-83AB
PB-83BB
PB-83CAA
PB-81JB
PB-81QA
PB-16DB
KZ6C051
KZ6C011
A122004
December 1997
December 1997
1
S3x4
2
3
1
5
S3x4
4
O3x25B
2
29
3
30
4
5
12
15
1
6
3
S3x4
2
PS3x6
23
PS3x6
4
5
13
8
6
O3x8B
24
31
29
9
30
PS3x6
21
31
3SW
6
13
7
14
25
PS3x6
21
6
28
3N
15
PS3x6
26
17
P3x12
26
20
10
3N
3SW
TS3x6
27
6
TS3x6
16
TS3x6
22
1PS2.6x6
F3x6
10
6
18
31
19
11
TS3x6
20
P3x12
F3x6
9 - 17
Connector Panel Assembly: CB-792
No.
1
2
3
4
5
6
7
9 - 18
Description
Panel, Connector
Connector, D sub 37pin
Terminal, Ground
Screw, Lock
AC Inlet
Connector, XL type, Male
Connector, XL type, Female
Parts No.
CB79201
CN237326
CN901040
CN7B-212
CN603012
CN103195
CN103194
Notes
May 1992
5
3
B3x8B
1
4
O3x8N
2
O3x8N
PU
SH
6
PU
SH
PU
SH
4
PU
SH
3
7
May 1992
9 - 19
MKIV-2
No.
1
2
3
4
5
6
7
8
9
10
10'
11
12
13
13'
14
15
16
17
18
19
20
9 - 20
Description
Tape Deck Assembly
Head Assembly
Audio Amplifier Assembl
Cover, Front
Cover, Front
Cover, Under
Panel A, Side
Panel B, Side
Cover, Ventilation
Frame R
Frame L
Panel, Rear
Bracket R, Chassis
Bracket L, Chassis
Frame, Under
Cover, Under
Foot
Washer, Trim
Washer, Trim
Washer
Stud
Parts No.
T0069
KH-44K
A1221
K117001
K117002
K117003
K117201
K117202
K117205
K117007
K117006
K117005
CB-794
K117210
K117211
K117209
K117212
CY4058
KZ6C028
KZ6C051
KZ6C011
KZ9L150A
Notes
December 1997
May 1992
9 - 21
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
9 - 22
Description
Panel, Deck Cover
Blind
Control Assembly
Angle
Panel, Deck
Transformer, Power
Frame
Angle
Bracket L
Bracket R
Bracket L
Bracket R
Bracket
Cover, Fuse
FUSE PCB Assembly
CONTROL PCB Assembly
Washer, Trim
Washer
Bracket L
Collar, Screw
Stud
Parts No.
T006711
T006703
CB-23U
T007107
T006701
TF11030
T007101
T506405
T007104
T007105
T007102
T007103
T006705
T005306
PB-7VCA
PB-4RMA
KZ6C051
KZ6C011
T006710
KZ7C091
KZ9L080A
Notes
May 1992
1
O3x8B
17
18
3
2
O3x8B
17
18
F4x15
F4x15
F4x12
F4x12
4
5
TS3x8
7
6
8
TS3x6
21
PS4x8
13
4W
4SW
14
4N
9
20
PS3x6
PS3x8
PS3x6
15
PS3x6
11
7
4N
10
TS3x6
21
19
PS4x6
PS3x6
4W
4SW
16
PS3x6
PS3x6
PS3x6
12
20
B4x8
TS3x6
PS3x8
TS3x6
PS4x6
PS3x6
TS3x6
30%
Y.Iwasaki
MX-5050
MKIV-2
CHASSIS A'y
T-0069
EX 00018
May 1992
9 - 23
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
9 - 24
Description
Head Housing Assembly
Stud
Base, Head
Spring, Head Adjustment
Bracket, Head
Post, Guide
Erase Head Assembly,
1/4" 2CH
Record Head Assembly,
1/4" 2CH
Reproduce Head Assembly,
1/4" 2CH
Cover, Housing
Head Housing, Front
Guide, Tape
Connector
Bracket, Connector
Plate, Shield
Pole, Guide
Clamp, Cable
Bracket L, PCB
Bracket R, PCB
Cover, Protection
HEAD, RELAY PCB Assembly
Washer, Polyslider
Parts No.
KH-4Y-A
KH4Y009
KH0C047
GS2016
KH0D178
KG4E001
Notes
Head Sub Assembly
KH-44KA
GH4E082B
GH4R005B
GH4P027B
KH0F038
KH0F037
KG4A003
CN314002
KH4Y004
KH4Y001A
KG6E020
PZ1G053
KH41I01
KH41I02
KH41T02
PB-78IAB
F523030
Head Sub Assembly
KH-44KA
May 1992
C3x8B
B3x8B
1
TS3x6
2
20
C3x6B
2
C3x12N
C3x12B
B3x8B
18
C3x12B
21
C3x12N
B3x8B
B3x8B
22
3
F3x6N
19
5
6
O3x30N
7
O3x10B
16
4
8
9
O3x10B
O3x10B
12
12
O3x10B
PS3x8
10
11
13
14
PS3x8
14
15
C3x12
C3x12
17
PZ3x6
C3x12
50%
MX-5050
BIII-2, MKIV-2
HEAD A'y
KH-44K
May 1992
9 - 25
Reel Assembly : KW-41J
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Description
Parts No.
Reel Shaft Assembly
KW-41DG
Reel Table Assembly
KW-41EA
Holder, Reel Table
KW0B056
Protector, Reel
KW0H007A
Bracket, Reel Motor
KW0G016
Motor, Reel
MR1C005
Base L, Brake
KW0G013
Bracket, Connector
KW41J01
Base R, Brake
KW0G012
Brake Band Assembly
KW-4J-A
Spring
GS1175
Stopper, Cable
KZ3A047
Pin, Solenoid
KZ5A003
Solenoid
GP1F03
Damper
PZ1B049
Guide, Brake
KW4B001
Drum, Brake
KW0A012
Ring, E type
F74TE15
Ring, E type
F74TE09
REEL MOTOR DRIVE PCB Assembly
PB-4RNA
21 Bracket A, Reel Motor Drive PCB T005317
22 Bracket B, Reel Motor Drive PCB T005318
9 - 26
Notes
May 1992
Reel Assembly: KW-41J
1
P3x8N
F4x8N
1
2
P3x8N
F3x6
3
F4x8N
4
C4x10
F3x6
2
F4x15
3
PS4x8
4
C4x10
5
4SW
F4x15
4N
6
20
7
21
TS3x6
PS4x8
8
PS4x10
5
PS3x6
4SW
4N
PS3x6
10
11
22
6
TS3x5
9
19
13
16
15
12
18
19
PS3x6
PS4x10
TS3x5
14
C3x6
19
3SW
10
3W
PS3x6
13
3W
3SW
15
C3x6
C4x10
18
17
11
14
19
16
12
PS3x6
C4x10
17
30%
MX-5050
ALL MODELS
REEL A'y
KW-21G
KW-41J
EX 00003
May 1992
9 - 27
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
9 - 28
Description
Cap. Pinch Roller
Shaft, Pinch Roller
Shaft, Arm
PinchRoller Arm Assembly
Solenoid
Screw, Adjustment
Damper
Washer Spherical
Spring
Nut, Dubble
Pin, Solenoid
Stopper, Solenoid
Stud
Bracket, Motor
Cap, Dust
Ring
Motor, Capstan
Shaft, Link Arm
Shifter Link Assembly
Collar
Shaft, Arm
Arm A, Lifter
Arm B, Lifter
Bracket, Shifter Solenoid
Solenoid
Arm, Link
Angle
Pipe, Rubber
Hook
Spring
Spring
Spring
Washer, Polyslider
Stud
Ring, E type
Ring, E type
Ring, E type
Parts No.
KP0C034
KP-4S-B
KP0B060
KP4L001
KP-4X-A
GP1B12
KZ6A113
PZ1C021
KP0G004
GS2163
F517-4
KZ5A003
KZ2A016
KZ9I250A
KC4H001
KC0B029
PZ1C130
MR-1L
KR4W005
KR-4W-A
KZ7C109
KR4B001
KR0B005
KR0B006
KR4W007
GP1A09
KR4W004
KZ3A042
PZ1C174
KZ3A167
GS1185
GS1028-A
GS1149
F524060
KZ7A823
F74TE09
F74TE20
F74TE15
Notes
May 1992
O3x10B
1
34
2
3
F3x10
F3x10
F4x12
F4x12
PS3x6
28
29
36
25
32
12
30
PS3x6
19
36
21
20
PZ3x6
36
PS4x6
12
6
26
36
7
36
37
27
13
14
8
35
PS3x6 14
3W
3W
PS4x8
PS3x6
22
4
14
14
23
16
15
5
17
31
38
18
9
10
11
PS4x10
24
33
C4x8
30
37
PS4x6
91'9.10
May 1992
50%
K.Sugimoto
MX-5050 BQIII,
BIII-2, MKIV-2
PINCH ROLLER,
CAPSTAN,
SHIFTER A'y
(KP-4X)(KC-41H)
(KR-4W)
9 - 29
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
9 - 30
Description
Cap, Arm
Arm, Tension
Shaft, Arm
Washer, Polyslider
Holder, Arm
Guide, Tape
Hook, Spring
Nut
Hook A, Spring
Arm, Stopper
Hook B, Spring
Switch Actuator Assembly
Magnet Assembly
Roller Assembly
Collar
Bearing
Ring
Holder
Spring
Washer
Ring, Shaft
Washer
Nut, Holder
Boss
Disk, Tacho
Stud
ROLLER TACHO PCB Assembly
Timer Display Assembly
Spring
Spring
Switch, Micro
Hook, Spring
Hook
Bracket
Parts No.
KA0C005
KA0A017A
KA4J001
F524-5
KA0B008
KG4D007
KZ3A024
KZ6D004
KA0E017
KA4X001
KA0E005
KA-4K-B
KA-4K-C
KI-4J-B
KZ7C057
BA1Z022
F7017
KI0B014
GS2077
KZ6C057
F7206
KI0H024
KI0H025
KI4T001
SR3Z033
KZ9H480C
PB-4HCA
ZA-95G
GS1025
GS1048
WH51027
KZ3A023
KZ3A167
KZ2A165
Notes
Impedance Roller
Sub Assembly
KI-4J-A
May 1992
1
F2x4
6
2
F3x6
14
3
4
SE
28
1
T
5
R
ZE
O
PE
TA
1
H EAR
S
M
EE
SP
CH
D
2
S
6
3
F2x4
H
S-
IP
T
E-
EA
M
L
EP
TI
R
%
R
CL
2
F3x6
F3x12
3
4
5
34
28
15
16
17
7
20
33
18
TP2.6x6
8
4
19
C3x10
20
29
PS4x6
8
4
C3x10
16
13
21
9
12
22
PZ3x6
23
10
30
24
3W
PS3x6
26
S3x4
11
3SW
B3x4
31
25
27
32
3W
PZ3x6
P2x5
PS3x15
3W
PS3x15
91'9.10
変更岩崎
May 1992
61%
K.Sugimoto
MX-5050 BQIII,
BIII-2, MKIV-2
TENSION ARM,
IMPEDANCE
ROLLER,
TIMER A'y
(KA-4X,KA-4Y)
(KI-4T)(ZA-95G)
EX 00030''
9 - 31
No.
1
2
3
4
5
A
B
C
D
E
F
G
H
H
6
7
8
9
10
11
12
13
14
15
9 - 32
Description
Panel, Control
Sheet, Control Panel
Switch, Power
Capacitor, Spark Killer
TRANSPORT CONTROL SWITCH
PCB Assembly
Button, CUE
Button, EDIT
Button,RECORD
Button, PLAY
Button, STOP
Button, F.FWD, RWD
Switch, Selector
Knob
Cap, Knob
Escutcheon, Switch
Escutcheon, Switch
Angle
Stud
Stud
Stud
Connector Housing, Plug
Connector Contact, Plug
Connector Housing, Receptacle
Connector Contact, Receptacle
Parts No.
CB23U01
CB23U02
WH42062
CZ20001W
PB-7UZA
KN2145
KN2147
KN2144
KN2142
KN2141
KN2143
KN2184
KN1108
KN1099
PZ4A026
PZ4A027
T006704
KZ7B160
KZ7B158
KZ7B159
CN402029
CN7B-041
CN402030
CN7B-042
Notes
Assembly
May 1992
PS3x6
5
11
1
PS3x6
11
PS3x6
G
9
H
10
P
DO ITCH
WN
CO
NT
RO
UP
L
RI
VA
G
15
14
13
12
OF
F
4
ON
TS3x6
PO
W
ER
9
EX
T
3
FIX
SP
EE
DM
OD
E
H
L
SP
EE
D
L
S
L
R
SU EEL
P
SIZ
T.U E
P
S
A
CU
E
ED
6
IT
9
B
C
D
E
F
7
2
F3x6B
8
PS3x6
50%
Y.Iwasaki
MX-5050 BQIII,
BIII-2, MKIV-2
CONTROL A'y
CB-23U
May 1992
9 - 33
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
9 - 34
Description
Cap, Knob
Knob
Collar
Knob
Spacer
Potentiometer
Amp. Trim Panel Assembly
Panel, Amp. Top
VU Meter
Jack, Phone
Switch
Button
Button
Button
Blind
Blind
Amp. Side L Assembly
Amp. Side R Assembly
Cover, Amp.
Amp. Connector Panel Assembly
Shield, Illumination
REC/REP AMP. PCB Assembly
LED (D) PCB Assembly
LED (F) PCB Assembly
LED (E) PCB Assembly
LED (C) PCB Assembly
REC EQ PCB Assembly
VU METER AMP. PCB Assembly
Washer, Trim
Washer
Spacer
Parts No.
KN1102
KN1100A
KZ7C111
KZ1063B
KZ6C017
RV224005
A1220-A
A1220-B
ME11005
CN602144
WH340013
KN2095
KN2094
KN2093
PZ1B012
PZ1B010
A1177-C
A1177-B
A117705
A117701
PZ1B013
PB-1GYB
PB-83AB
PB-83BB
PB-83CAA
PB-81JB
PB-81QA
PB-16DB
KZ6C051
KZ6C011
A122004
Notes
December 1997
December 1997
1
S3x4
2
3
1
4
O3x25B
2
30
S3x4
5
29
3
4
5
12
15
1
6
2
3
PS3x6
23
PS3x6
5
S3x4
4
13
8
6
O3x8B
24
31
29
9
30
PS3x6
21
31
3SW
6
13
7
14
25
PS3x6
21
6
17
19
15
PS3x6
26
28
3N
B3x6B
26
10
6
TS3x6
3N
3SW
27
16
1PS2.6x6
22
TS3x6
10
31
6
11
TS3x6
B3x6B
18
20
9 - 35
Amp. Connector Assembly: A1221
No.
1
2
3
9 - 36
Description
Amp. Connector Panel Assembly
Connector, XL type, Male
Connector, XL type, Female
Parts No.
A117701
CN103195
CN103194
Notes
December 1997
O3x8N
1
O3x8N
2
3
PU
SH
PU
SH
PU
SH
PU
SH
Amp. Connector Assembly: A1221
December 1997
9 - 37
No.
1
2
3
4
5
9 - 38
Description
Panel, Connector
Connector, D sub 37pin
Screw, Lock
AC Inlet
Terminal, Ground
Parts No.
CN7B-212
CN237326
CN7B-212
CN603012
CN901040
Notes
May 1992
1
3
B3x8B
4
5
2
3
5
5
Y.Iwa
MX-5050
MKIV-4,M
May 1992
9 - 39
Appendix
Block Diagram
FM
LINE IN
MIC IN
COM TEST OSC
LINE IN
AMP
SEL-REP
AMP
COM. REP MODE
REC HEAD
REP
Block Diagram
10K
–18V
TEST OSC
MIC GAIN SEL
MIC ACTIVE
BAL. AMP
1K
REC SEL
COM. REC
REC LEVEL SEL
REC PRE
AMP
COM.
CUE ATT
LOW COMP
ADJ
MIC LEVEL ADJ
LINE LEVEL ADJ
COM. EQ SEL
EQ VR
EQ AMP
LOW COMP
BIAS OSC
SRL
NORMAL
OUTPUT LEVEL ADJ
BIAS ADJ
REC OUT
AMP
COM.
EQ SEL
SOURCE
TAPE
TO SEL-REP
AMP
LINE OUT
AMP
PEAK AMP
REC SEL
REC SEL
ACTIVE
BAL. AMP
PHONE
AMP
VU AMP
ERASE
REC
LINE OUT
VU
Power is not being
supplied to machine
VU meter lamp does
not illuminate
Main fuse is blown
Play, F.FWD, RWD
modes do not work
Tape is threaded
incorrectly
Tension Arm with safety
switch is at lower position
Timer does not work
or works in reverse
Tape is threaded
incorrectly
Machine does not stop
when Stop is pressed
Is counter working
correctly?
YES
CONTROL PCB
is defective
NO
NO
Tape is threaded
incorrectly
Counter roller is
defective
Troubleshooting
(Transport)
Capstan motor does
not rotate
Tension Arm with safety
sensor is at lower
position
Capstan motor is
defective
Pinch roller not
engaging well
Capstan speed is
inaccurate.
Wow is out of spec
Pitch Control knob
not set to FIX
Capstan motor is
defective
Correct reel size is
not selected
F.FWD, RWD speed
becomes slow
Tape may be worn out.
Tape may be stuck to
guides.
Try another tape on
the machine
Can tape move if
threaded directly
reel to reel?
YES
Tape may be stuck to
guides
Clean tape path
NO
Mechanical system not
functioning properly
Machine does not
work at all
Does VU meter
lamp illuminate?
YES
Is tape counter working
correctly?
NO
Main fuse is blown
NO
Control PCB is
defective
Set to SEL-REP
and check if machine
reproduces
Machine does not
reproduce tape
Set to INPUT and
check if input signal
is output
YES
Reproduce head is
defective
Reproduce amp is
defective
NO
S
YE
NO
Reproduce amp is
defective
Power supply or
output amp is bad
Make sure output knob
is not at minimum and
SRL is off
Confirm if VU meter
operates properly in
INPUT mode
S
YE
NO
Machine does not
record
Proceed to next step
i.e., confirm REC LED
illumination
Input Amp is defective
Bias circuit is defective
S
YE
Confirm if REC LED
(AMP & REC button lamp)
lights
NO
NO
Troubleshooting Hints
Electronics
AMP LED only does
not light
CONTROL PCB, AMP PCB
or cables defective
Both AMP & REC
LEDs do not light
REC SW is defective
Confirm that tape path
is not dirty
CONTROL PCB is defective
Adjust reproduce
frequency response
with Repro test tape
Reproduce frequency
response is bad
Frequency response
is not flat
Confirm that tape being
used is same as tape used
for adjustment
Record frequency
response is bad
If freq response is bad
at all frequencies, check
for following problems
Confirm that tape being
used is same as tape used
for adjustment
NO
Check EQ and bias. If OK,
Amp or Head is bad
EQ, Bias need to be
adjusted
If freq response is bad
at one speed, readjust
for that speed
Confirm if frequency
response is bad at only
one speed
Input and REC/REP
levels are different
S
YE
YES
Heads are dirty, or
Amp is defective
Adjust Bias and REC
levels with correct tape
NO
Readjust REC level
Noise in INPUT mode
Noisy even with input
disconnected
Noise in REC/REP mode
Head and tape path
should be demagnetized
Noise in recorded signal
Mixing console and
recorder levels are
different
INPUT Level Matching
needs to be adjusted
Input amp is bad
Index
A
E
AC Voltmeter, 7-2, 7-6, 7-7
Adding Punch In, 2-7
AGFA, 7-8
AMP Section, 2-9, 2-11,
Amplifier Panel, 3-7
AMPEX, 7-8
Attenuation Switch, 2-3
Audio Signal Connection, 2-3
Audio Connector Panel, 3-9, 3-10
Auto Locator, Built- In, 4-11
Auto Locator, CB-119, 8-4
Auto Locator, CB-120, 8-4
Azimuth Adjustment, Repro,7-5
Azimuth Adjustment, Record, 7-9
Edge Type, 2-7
EDIT Button, 3-5
EDIT Mode, 4-3, 4-9
EIA Reel, 4-5
Equalizer Change, 2-15
Equalizer Indicator, 3-7
Equalizer Switch, 3-11
Equalization, 8-3
Equalization Adjustment, Repro, 7-7
Equalization Adjustment, Record, 7-11
EQ Indicator, 3-8
Erase Frequency, 8-4
Erase Head, 3-6, 5-3
Exterior View, 1-2
EXT mode, 3-4
B
BASF, 7-8
Bias Adjustment, 7-8
Bias Frequency, 8-4
Bottom Cover, 2-9
Brake Torque Adjustment, 6-2
C
Capstan Motor Adjustment, 6-5
Capturing Tape Location, 4-11
Capstan Shaft, 3-2, 5-3, 6-6
Capstan PLL Reference, 2-6
Center Tape Guide, 5-3
CLR Key, 3-4, 4-7, 4-12
Cleaning, 5-3
Connector Pin Assignment, 2-4
CONTROL PCB, 2-6, 2-9, 2-12, 6-5, 6-8
Crosstalk, 8-4
CUE Mode, 4-2, 4-3
Tapping Cue Button, 4-8
Holding Cue Button, 4-8
CUE Button, 3-5, 4-8
D
Damp Setting, 6-5
DC Servo Motor, 3-2
Demagnetizing, 5-2
Depth of Erasure, 8-4
Demagnetizing, 5-2
Dimensions, 8-4
DIN Hub, 4-5
Distortion, 8-4
Dump Edit Mode, 3-5
Dummy Head, 3-6
Dust Cap, 5-4
May 1992
F
Fast Wind Mute, 2-6, 4-9
Fast Wind Time, 8-2
Felt pad, 5-4
F.FWD, 1-3, 3-5, 4-2, 4-9
Frequency Response, 8-3
Full Track, 1-2
Full Track Kit, 8-4
Fuse, 2-2, 2-14, 2-15
Fix mode, 2-7,3-4, 6-5
G
Gain, Capstan, 6-5
Ground Terminal, 3-11
H
Heads, 8-2
Head Cover, 6-10
Head Guide, 3-6
Heat Sink, 2-10, 2-12
Head Housing, 5-4
Height Adjusrment, Head, 6-11
I
IEC, 2-15
Input Connectors, 3-9
Input Level, 8-3
Input Transformers, Option, 2-4
Input Level Knob, 3-7, 3-8, 4-7
Input monitor, 4-2, 4-4
J
Jitter, 6-5
INDEX
1
Index
L
R
Level Type Signal, 2-7
Lifter Defeat, 4-3
Line Input, 8-3
Line Input Connectors, 3-9
Line Output, 8-3
Line Output Connectors, 3-9
Lissajous Pattern, 7-6, 7-9
Low Comp Pot, 7-4
Low Version Models, 7-7
Low Frequency Reproduce Equalization Adjustment, 7-11
Lubrication Oil, 2-2, 5-2, 5-4
Maintenance Schedule, 5-2
Mic. Input Connector, 3-11
Mic. Attenuator, 2-5, 3-11, 7-4
Mini Locator, 1-3, 4-11
Monitor Selection, 7-4
Motor, 8-2
Monitor Button, 3-8
MRL Tape, 7-2
Ready, 4-4, 4-7
Rear Head Escutcheon, 5-4
Recording, 4-7
Record Bias Level, 7-8
RECORD button, 3-5
Record Head, 3-6
Record Head Azimuth Adjustment, 7-9
Record Mode indicator, 3-8
Record Ready buttons, 3-8
REC/REP AMP PCB Assembly, 2-9
Reel Adapter, 4-5
Reel Clamp, 2-2
Reel Size, 8-2
Reel Size Change Switch, 3-5
Reel Table Height Adjustment, 6-9
Reference Flux Indicator, 3-8
Reference Flux Switch, 3-11
Remote Control Connector, 3-13
Repeat Button, 3-4
Repeat mode, 4-13
Reproduce Head, 3-6
Rewind button, 3-5
O
S
Operating Envionment, 8-4
Optional Accessories, 8-4
Output Transformers, Optional, 2-4
Output Level, 8-3
Output Level knob, 3-8
Output Level Setting, 2-5
Output Level Switch, 2-5, 3-11
Search mode, 4-11
Search Play, 4-12
Search Zero, 4-12
Search Start, 4-12
SEARCH 3 Key Function, 2-7
SEARCH ZERO button, 3-4
SEARCH 1, 2, 3 buttons, 3-4
Safe Mode, 4-4
SEL-REP Mode button, 3-8
SEL-REP Indicator, 3-8
SEL-REP Level Adjustment, 7-12
SET button, 3-3
SEL-REP Recording, 4-8
SEL-REP Monitor Mode, 4-4
Signal to Noise Ratio, 8-3
Speed Mode Select button, 3-4
Speed Mode Indicator, 3-4
Speed Version Selection, 2-6, 2-15
SRL Indicator, 3-8
Standard Reference Flux, 8-3
Start Time, 8-2
Stop Time, 8-2
STOP button, 3-5
Storage Environment, 8-4
Supply Reel Table, 3-2
M
P
Parallel I/O Connector, 3-11, 3-12
Peak Level Indicator, 3-8
Peak Indicator Level, 7-3
Phone Jack, 3-8
Pinch Roller, 3-2, 5-4
Pinch Roller Pressure, 6-6, 6-7
Pitch Control, 4-10
Pitch Control Knob, 3-4
Playing Back, 4-7
PLAY button, 3-5
Power Connector, 2-13, 3-11
Power Cable, 2-2, 2-13
Power Switch, 3-3
Punch In/Out, 2-6
INDEX
2
May 1992
Index
T
Tacho Roller, 3-2
Take Up Reel Table, 3-2
Tape Editing, 4-9
Tape Lifter Adjustment, 6-4
Tape Monitor Mode, 4-4
Tape Speed Accuracy, 8-2
Tape Speed Adjustment, 6-8
Tape Speed Deviation, 8-2
Tape Speed Indicator, 3-3
Tape Speed Select button, 3-5
Tape Spped Variable Range, 8-2
Tape Time Display, 3-3
Tape Width, 1-2, 8-2
Tension Arm, 3-2
Test Oscillator, 4-13
Test Oscillator buttons, 3-8
Test Oscillator Frequency, 8-4
TIME IPS % buttton, 3-4
Track Configuration, 8-2
Trigger Level, 7-3
V
Vari Speed, 4-2
VU Meter, 3-8
W
Wear Pattern, 6-11
Weight, 8-4
Wow & Flutter, 8-2
Wrap Adjustment, 6-12
Z
Zenith, 6-11
May 1992
INDEX
3

MX-5050mkIV-2/BIII manual, edition 4

Transcription

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